Image Disk structure2.svg thumb Figure 1. Disk structures br A Track br B Geometrical sector br C Track sector br D cluster file system Cluster In computer disk storage, a sector is a subdivision of a Track disk drive track on a magnetic disk or optical disc . Each sector stores a fixed amount of user ... of 512, 1024, 2048, or 4096. Cray Research had an 819 disk controller in 1975 that transferred 512 64bit words per sector. Later, Specify date March 2011 hard disk drives supporting 1,024 byte sectors ... the outside of the disk. However, each sector still contained the same number of bytes. This was accomplished .... See also CD ROM CD ROM format CD ROM format Cylinder head sector Block data storage Disk storage Disk formatting Hard disk drive partitioning File Allocation Table Sector slipping References Reflist ... accessible data per sector. Newer hard drives use 4096 byte 4 KB or 4K Advanced Format sectors. Mathematically, the word sector means a portion of a disk between a center, two radius radii and a corresponding arc see Figure 1, item B , which is shaped like a slice of a pie. Thus, the disksector Figure 1, item C refers to the intersection of a track and mathematical sector . In disk drives, each physical sector is made up of three basic parts, the sector header, the data area and the error correcting code ECC . The sector header contains information used by the drive and controller. This information ... was replaced by sector, and block became associated with the data packets that are passed in various ..., does not change the actual sector size of a medium, only specifying the size of the blocks that the program will manipulate. The standard sector size of 512 bytes for magnetic disks was established with the inception of the hard disk drive in 1956. Dubious date March 2012 Through a coordinated effort organized by the industry trade organization, International Disk Drive Equipment and Materials ... 2011 to define the implementation and standards that would govern sector size formats exceeding 512 ... more details
Wiktionary sectorSector may refer to Places Sector, Devon , a location in the county of Devon in south western England Sector, West Virginia , an unincorporated community in Hampshire County, West Virginia, United States of America In computing Cylinder head sector or CHS , an early method for giving addresses to each physical block of data on a hard drive Disksector , a physical subdivision of space on a computer disk storage medium, specifically a subdivision of a track in portal rendering , a convex polygonal segment of map space used to facilitate calculation of the visibility of objects in a computer display In mobile communications networks Sector antenna , to see the area spanned by an antenna on a mobile phone mast Geographic subdivisions Sector country subdivision Geometry Circular sector , also known as a pie piece , the portion of a circle enclosed by two radii and an arc Spherical sector , portion of a sphere enclosed by a cone of radii from the center of the sphere. Hyperbolic sector , is a region of the Cartesian plane bounded by rays from the origin to two points a, 1 a and b, 1 b and by the hyperbola xy 1. Fictional uses Sector Star Trek , a fictional area of space designation used in the Star Trek universe for interstellar navigation Sector General , a series of books about an interstellar hospital in Space, written by James White Other uses Sector economic one of several subdivisions in an economic system used for analysis and classification Sector instrument ... of two rulers of equal length joined by a hinge Sector lights , one of three areas relative to a shallow water navigational channel Sector Air Traffic Control , a three dimensional zone within controlled ... Coast Guard Sectors , a shore based operational unit of the United States Coast Guard SECTOR , a United ... also Zone disambiguation Region Area disambiguation de Sektor es Sector fr Secteur ko it Settore lt Sektorius reik m s hu Szektor egy rtelm s t lap nl Sector ja pt Setor ro Sector dezambiguizare ... more details
Notability Products date October 2009 Refimprove date November 2009 The term disk to disk , or D2D , generally refers to disk to disk backup. With D2D, a computer hard disk is backed up to another hard disk rather than to a tape or floppy. D2D is often confused with virtual tape , but differs in that it enables multiple backup and recovery operations to simultaneously access the disk directly by using a true file system. ref citebook title Backup and recovery first W. Curtis last Preston edition 2 publisher O Reilly Media year 2006 ISBN 0596102461 pages 219 ref Typical advantages of disk to disk Higher speed and higher capacity, relative to tape or floppy, resulting in shorter backup and recovery windows. Non linear recovery of data, enabling a specific file to be restored quicker and simpler than with tape. Lower total cost of ownership due to increased automation and lower hardware costs. Citation needed date August 2008 Remote backup services Remote backup service s are closely related to D2D backup as they are most often stored remotely on disk. The only major difference is that the data tends to be held at a remote location and these services are often provided by List of backup software Managed backup providers . References refs compu storage stub Category Computer backup Category Disk cloning ... more details
Unreferenced date October 2011 Infobox short story See Wikipedia WikiProject Novels or Wikipedia WikiProject Books name The Disk title orig El Disco translator author Jorge Luis Borges country Argentina language Spanish language Spanish series genre Fantasy , short story published in The Book of Sand book The Book of Sand publisher media type Print pub date 1975 english pub date 1977 The Disk is a 1975 in literature 1975 short story written by Argentina Argentinian writer Jorge Luis Borges . It appears in the collection The Book of Sand book The Book of Sand . Synopsis The story deals with a woodcutter who lives in the midst of a deep wood in old England and who has never seen the sea. He tells the reader that at one time a man, who asks lodging from him appears at his door. The woodcutter notes that the man was elderly, as he referred to England as Saxony , which, at the time, was a sign of age. The day after the man wishes to leave, but before he does, he says that he is a King and is descended from Odin . He tells the woodcutter that he is exiled, but that he shall always be a king, because he holds the Disk of Odin, the sole thing in the world that has but one side. He opens his hand and shows the disk the woodcutter sees only an empty palm, but thereafter touches it, feeling a chill in the fingers and seeing a flash. He makes a false claim that he has a full chest of gold and wants to trade it for the disk, because he knows the man will decline. And the man does, to which the woodcutter replies that the man may go. When he turns around, the woodcutter kills the man with an axe. He then drags the body and throws it into the river. He then comes back and searches for the disk, which he never finds. See also portal Novels Bibliography of Jorge Luis Borges Jorge Luis Borges DEFAULTSORT Disk, The Category 1975 short stories Category Short stories by Jorge Luis Borges story stub es El disco ... more details
Infobox television show name The Sector image caption genre Unbulleted list Action fiction Action Drama Science fiction on television Science Fiction format Serial radio and television Serial opentheme writer Matthew Benay br Aaron Benay director starring country Unbulleted list United States Germany language English language English num episodes list episodes executive producer Unbulleted list Ridley Scott Tony Scott producer location runtime company Scott Free Productions br Tandem Communications distributor Home Box Office Home Box Office, Inc. channel TBA picture format 1080i HDTV first aired Start date 2012 df y last aired preceded by followed by The Sector is an upcoming Action fiction Action Science fiction on television Science Fiction television series executive produced by Ridley Scott Ridley and Tony Scott and written by Matthew and Aaron Benay. The series will follow the commander of a paramilitary unit who pursues a dangerous new race of genetically enhanced humans. ref http screenrant.com sector cinemax ridley tony scott yman 108902 Ridley & Tony Scott Bring The Sector to Cinemax Screen Rant April 2, 2011 ref It was originally announced to air on Cinemax and is co produced with Tandem Communications and Scott Free Productions , the same team behind Starz TV channel Starz original series, The Pillars of the Earth TV miniseries The Pillars of the Earth . However, on August 31, 2011 it was announced that Cinemax had passed on the show, with a clarification that the original order was only for a pilot plus the show bible. ref name Sector Dropped cite web last Andreeva first Nellie title Cinemax Passes On The Sector Series Eyes Potential Move To Science Channel url http www.deadline.com 2011 08 cinemax passes on the sector series eyes potential move to science channel work Deadline Hollywood date August 31, 2011 accessdate February 29, 2012 ref It was simultaneously ... Sector Dropped References Reflist US sf tv stub DEFAULTSORT Sector, The Category American science fiction ... more details
A disk editor is a computer program that allows its user to read, edit, and write raw data at ASCII character or hexadecimal , byte byte levels on disk drives e.g., hard disk s, USB flash disk s or removable media such as a floppy disk s as such, they are sometimes called sector editors, since the read write routines built into the electronics of most disk drives require to read write data in chunks of disksectorsector s usually 512 bytes . Many disk editors can also be used to edit the contents of a running computer s computer memory memory or a disk image . Unlike hex editors, which are used to edit Computer file files , a disk editor allows access to the underlying disk structures, such as the master ... directories . Programmers can use disk editors to understand these structures and test whether ... disk editors include special functions which enable more comfortable ways to edit and fix file systems or other disk specific data structures. Furthermore some include simple file browsers that can present the disk contents for partially corrupted file systems or file systems unknown to the operating system. These features can be used for example for file recovery. History Disk editors for home ... resets, instead of having to be re loaded on the same disk drive that later would hold the floppy to be edited the majority of home computer users possessed only one floppy disk drive at that time . Having the disk editor on cartridge also helped the user avoid editing damaging the disk editor application disk by mistake. All disk editors strive to be better than code debug command DEBUG ... from a Floppy disk floppy or Hard disk drive hard disk based on the BIOS . This permits simple disk ... and is in essence useless as disk editor for the system drive. The Resource Kit and the support ... Technet accessdate 2011 07 05 ref as a very simple disk editor supporting the use and modification ... of some disk editors or products containing them This is a list of utility software utilities for performing ... more details
Merge to Floppy disk variants discuss Talk Floppy disk Merge discussion Flippy disk date July 2011 unreferenced date October 2007 A flippy disk sometimes known as a flippy is a Double sided disk double sided 5 floppy disk , specially modified so that the two sides can be used independently but not simultaneously in single sided drives. Use of flippy disks was most common during the 8 bit home computer era of the early to mid 1980s. Generally, there were two levels of modifications For Disk Operating System s that did not use the Hard sectoring index hole in the disk to mark the beginnings of tracks, the flippy modification required only a new write enable notch to be cut. For this purpose, specially designed single square hole hole punchers, commonly known as disk doublers , were produced and sold by third party computer accessory manufacturers. Many users, however, made do with a standard round hole puncher and or an ordinary pair of scissors for this job. For disk operating systems that did ... sectored formats, an additional window must be punched for the sector holes. While cutting a second notch was relatively safe, cutting additional windows into the jacket was at great peril to the disk within. A number of floppy disk manufacturers produced ready made flippy media. As the cost ... sensors so that the disk could be flipped over without the necessary index hole punch. Data written with these rare drives complicates conversions today for retrocomputing archivists due to the sector .... Two versions on one disk During the time of single sided floppy disks some software manufacturers would use the two sides of one floppy disk to store two different copies of the same program. Each side ... II family Apple II or an Atari 8 bit family Atari 8 bit version on the other side of the disk. These releases ... placed on the flip side of the disk. If one put the disk into the drive upside down, the game played ... Category Floppy disk drives Category Legacy hardware ... more details
the sectors unusable all file systems contain provisions for bad sector marks and the operating system skips them in the future. When a sector is found to be bad by the firmware of a disk controller, the disk controller remaps the logical sector to a different physical sector. In the normal operation ... to the rest of the system. There are two types of remapping by disk hardware P LIST Mapping during factory production tests and G LIST Mapping during consumer usage by disk microcode . ref http www.mjmdatarecovery.co.uk workings hard disk bad sector mapping.html ref There are a variety of utilities ... corruption western digital Bad sector corruption DEFAULTSORT Bad Sector Category Hard disk computer ...about a hard drive fault the ambient noise music project Bad Sector the Linux utility Badblocks A bad sector is a Disksectorsector on a computer s disk drive or flash memory that cannot be used due to permanent damage or an OS inability to successfully access it , such as physical damage to the disk ... flash memory transistors. It is usually detected by a disk utility software such as CHKDSK or SCANDISK ... Typically, automatic remapping of sectors only happens when a sector is written to. The logic behind this is presumably that even if a sector cannot be read normally, it may still be readable with data recovery methods. However, if a drive knows that a sector is bad and the drive s controller receives a command to write over it, it will not reuse that sector and will instead remap it to one of its spare sector regions. Citation needed date April 2009 doesnt it try writing and reading before remapping? This may be the reason why hard disks continue to have sector errors mostly disk controller timeouts until all the bad sectors are remapped typically this is accomplished by Disk formatting Disk ... Technology Known ATA S.M.A.R.T. attributes SMART attribute number 197 Current Pending Sector Count ... ACS.pdf pages 198 213, 327 344 ref See Also Sector slipping a method of avoiding bad sectors. References ... more details
system treats the contents of those tracks as a single cylinder. DisksectorSector A segment ...Unreferenced date June 2010 Disk storage or disc storage is a general category of storage mechanisms ... to as the Computer data storage media media . A disk drive is a device implementing such a storage ... the media as in compact disc drive and the compact disc. Notable types are the hard disk drive HDD containing a non removable disk, the floppy disk floppy disk drive FDD and its removable floppy disk ... File SixHardDriveFormFactors.jpg thumb Six hard disk drives File Floppy Disk Drives 8 5 3.jpg thumb Three floppy disk drives File Asus CD ROM drive.jpg thumb A CD ROM optical disc drive Background ... disk storage device was the IBM IBM magnetic disk drives IBM 350 RAMAC 350 shipped in 1956 as a part ... , high density storage provided by tape drive s using magnetic tape . Vigorous innovation in disk ... per bit gap between disk and tape, reducing the importance of tape as a complement to disk. Disk ... 180px heights 135px perrow 2 align right Image Samsung HD753LJ 01 Top.jpg center A typical hard disk ... Image Samsung HD753LJ 03 Opened.jpg center Top cover removed center Image Hard disk platters and head.jpg ... and disk center Image Hard disk head.jpg center Head on the disk platter center gallery Too HDD specific, putting better images in intro Digital disk drives are Computer data storage block storage devices . Each disk is divided into logical Block data storage blocks collection of sectors . Blocks are addressed ... to disk happens at the granularity of blocks. Originally the disk capacity was quite low and has been .... The drive stores data onto Cylinder head sector cylinders, heads, and sectors . The sectors unit is the smallest size of data to be stored in a hard disk drive and each file will have many sectors ... into a format that the individual drive can use to store onto the disk itself. The data is then passed ... disk storage.svg thumb 300px Comparison of several forms of disk storage showing tracks not to scale ... more details
by the holes in a Nipkow disk A Nipkow disk sometimes Anglicized as Nipkov disk , also known as scanning disk , is a mechanical, geometrically operating image scanning device, invented by Paul Gottlieb Nipkow . This scanning disk was a fundamental component in mechanical television through the 1920s. Design The device itself is nothing more than a mechanically spinning disk of any suitable material ... of the disk and proceeding to the center of the disk, much like a gramophone record . The holes, when the disk rotates, trace circular ring surfaces, with inner and outer diameter depending on each hole s position on the disk and thickness equal to each hole s diameter. These surfaces may or may not partly overlap, depending on the exact construction of the disk. Process A lens projects an image of the scene in front of it directly onto the disk. ref cite web url http users.swing.be philippe.jadin nipkowdisk.htm title The Nipkow disk publisher Users.swing.be date accessdate 2010 03 02 ref Each ... by a sensor. If a light is controlled behind a second Nipkow disk rotating in synch at the same ... projected onto the original receiving disk. When spinning the disk while observing an object through the disk, preferably through a relatively small circular sector of the disk the viewport , for example, an angular quarter or eighth of the disk, the object seems scanned line by line, first by length or height or even diagonally, depending on the exact sector chosen for observation. By spinning the disk rapidly enough, the object seems complete, in a way similar to cinematography , and capturing ... of the disk but a small rectangular area with black cardboard which stays fixed , spinning the disk and observing an object through the small area. Here arises one of the drawbacks of the Nipkow disk ... disk should have either a very large diameter, which means smaller curvature , or a very narrow ... smaller holes millimeter or even micrometre micrometer scale closer to the outer sectors of the disk ... more details
A disk compression utility software software utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility which compresses only specified files and which requires the user computing user designate the files to be compressed a disk ... information needs to be stored to the hard disk, the utility will data compression compress the information. When information needs to be read, the utility will decompress the information. A disk compression ... software application s access the hard disk using these routines, they continue to work after disk compression has been installed. Disk compression utilities were popular especially in the early 1990s ... rather expensive at the time, costing roughly 10 USD per megabyte. For the users who bought disk ... more disk space as opposed to replacing their current drive with a larger one. A good disk compression utility could, on average, double the available space with negligible speed loss. Disk compression ... to increased capacities and lower prices. Note While the most familiar disk compression utilities ... , for example, worked on the Apple Macintosh platform. Common disk compression utilities Standalone ... from Salient Software Bundled utilities The idea of Bundling marketing bundling disk compression ... disk compression works Disk compression usually creates a single large file, which becomes a Storage virtualization virtual hard drive. This is similar to how a single physical hard drive can be disk ... BIOS loads sector 0 of the first physical hard drive partition sector Partition sector loads sector 0 of the bootable partition. In this case, it s the host drive. Host drive sector 0 loads in the case ... Impacts On systems with slower hard drives, disk compression could actually increase system performance. This was accomplished two ways Once compressed, there was less data to be stored. Disk .... If the system was already CPU bound , disk compression will decrease overall performance. Drawbacks ... more details
Multiple issues original research December 2011 refimprove December 2011 merge to disk image date December 2011 Disk cloning is the process of copying the contents of one computer hard disk to another disk or to an image file. This may be done straight from one disk to another, but more often, the contents of the first disk are written to an disk image image computer file file as an intermediate step, then the second disk is loaded with the contents of the image. Typically, this is done for archiving purposes, to restore lost or damaged data, or to move wanted data into a new disk, though other reasons also exist. Unlike standard copying functions, disk cloning involves copying hidden and in use ... to address these and other issues. Common Uses There are a number of notable uses for disk cloning software. These include Reboot and restore a technique in which the disk of a computer is automatically ... An individual user may use disk copying cloning to upgrade to a new, usually larger, hard disk ... or information. How it works This article is specific to disk cloning on the x86 platform specific details may not apply to other platforms. To provision the hard disk of a computer without using disk ... IBM PC partition s on the diskDisk formatting Format each partition to create a file system ... software With disk cloning, this is simplified to Install the first computer, as above. Create an image of the hard disk optional Clone the first disk, or its image, to the remaining computers ... used hardware disk copying machines to copy software. This had the disadvantages of copying not just the used data on the disk, but also unused Disksectorsector s, as the hardware used was not aware of the structures on the disks. A larger hard disk could not be copied to a smaller one, and copying a smaller one to a larger left the remaining space on the new disk unused. The two disks ... format zip to copy files. It is not sufficient simply to copy all files from one disk to another, because ... more details
a virus written to their first sector which silently infect the host computer if switched on with the disk ... boot sector on the floppy disk, not in the format of a normal disk Computer file file . IO.SYS or IBMBIO.COM ... of files into the USB drive and the installation of a bootloader. FreeDOS A valid boot sector on the disk COMMAND.COM KERNEL.SYS Linux A bootloader such as SYSLINUX or GRUB Linux kernel Initial ram disk initrd See also Booting Boot sector Darik s Boot and Nuke Data recovery El Torito CD ROM standard ...A boot disk is a removable digital data storage medium from which a computer can load and run booting boot an operating system or utility program. The computer must have a built in program which will load and execute a program from a boot disk meeting certain standards. Boot disks are used for Operating system installation Data recovery Data remanence Purging Data purging Hardware or software troubleshooting Customizing an operating environment Software demonstration Administrative access in case of lost password is possible with an appropriate boot disk with some operating systems Games e.g. for Amiga games Amiga home computers While almost all modern computers can boot from a hard drive containing ... program to use some system RAM as a RAM disk for temporary computer file file storage. As an example ... versions of Linux . The most commonly available floppy disk can hold only 1.4 Megabyte MB of data in its ... flash drives . Booting from a disk A modern PC is configured to attempt to boot from various devices ... be made. Modern Apple computers will boot from an appropriate disk if the user presses the C key while the machine is starting. Required files Different operating systems use different boot disk contents ... Disks http bootdisk.com Boot Disk information, sources, and tools HSW harvard extension schools computer science e 1 understand 2740 creating a boot disk video Creating a Boot Disk Category Booting ar da Bootdisk de Bootf higes Medium fr Disquette de d marrage ko id Boot disk it Disco ... more details
disk, normally writes 18 Disksectorsector s of 512 byte s to each of 160 tracks 80 on each ... up an empty file system on the disk and, for PC s, installing a boot sector . This is a fast ...Image Formatting c drive.JPG thumb Formatting a hard drive using MS DOS Disk formatting is the process of preparing a hard disk drive or flexible disk medium for data storage. In some cases, the formatting ... and the term format is understood to mean an operation in which a new disk medium is fully ... s FORMAT.COM utility as a hard drive is being formatted. As a general rule, formatting a disk is destructive ... number of bytes, is the unit of memory that is read from and written to a disk by a disk driver. The earliest disk drives had fixed block sizes e.g. the IBM magnetic disk drives IBM 350 IBM 350 disk storage ... 1301 disk storage unit author publisher IBM date accessdate 2010 06 24 ref IBM marketed subsystems ... access storage device disk subsystems on the IBM System 360 expanded this concept in the form of Count ... storage 3390.html IBM 3390 direct access storage device ref Modern hard disk drives such as Serial ... and Serial ATA SATA ref ISO IEC 791D 1994, AT Attachment Interface for Disk Drives ATA 1 , section ... hard disk drive manufacturers began releasing hard disk drive platforms using the Advanced Format of 4096 ... Sector Transition Begins ref ref http www.seagate.com ww v index.jsp?locale en US&name advanced ... to 4K Sectors , Seagate Corp. ref Floppy disk s generally only used fixed block sizes but these sizes were a function of the host s Operating System OS and its interaction with its Floppy disk ... sizes depending upon the host OS and controller. Optical disk s generally only use fixed block sizes. Disk formatting process Formatting a disk for use by an operating system and its applications ... of the disks with markers indicating the start of a recording block typically today called sector markers and other information to be used later, in normal operations, by the disk controller to read ... more details
Orphan date February 2009 Sector slipping is a technique used to deal with defective Disksector sectors in hard disk drives. Due to the volatility of hard disk s from their moving parts and low tolerances some sectors become defective. Defective sectors can even come on hard disks from the factory so most disks incorporate a bad block recovery system to cope with these issues. Description During a low level Disk formatting format , defect lists are populated which store which sectors are bad. The bad sectors are then mapped and a sector slipping algorithm is utilized. When using sector slipping for bad sectors, disk access time is not largely affected. The drive will just skip over the sectors and takes the same time as it would have to read the sector. Spare sectors are located on the disk to aid in having sectors to slip other sectors down to, allowing for the preservation of sequential ordering of the data. Accuracy of programs reliant on static knowledge of cylinders and block positions will be compromised though. Bad sectors that are found during normal usage of the disk are not capable of having the sector slipping algorithm applied. Instead a linear reallocation, or sector forwarding, is used where a bad sector is replaced with a sector from a spare area. Doing this does affect access times as the disk will need to seek to the spare sector since all further lookups of the bad sector will redirect to the new sector. Example pre Logical Sectors Physical Sectors Pre Low Level Format 0 0 1 1 2 2 3 3 4 4 5 5 6 7 Logical Sectors Physical Sectors Post Low Level Format 0 0 1 1 2 2 3 Bad 3 4 5 Bad 4 6 5 7 pre In this example, physical sectors 3 and 5 were found to be bad. The sectors ... on good sectors. Sector 3 was slipped down to 4 and sector 4 was slipped down to 6. The rest of the sectors were slipped down to the remaining spare sectors Sector 4 to 6 and sector 5 to 7. Notes references ... for Modern Disk Drives and Non Random Workloads Category Computer data Category Computer file ... more details
Image Disk II.jpg thumb right Disk II drives. The Disk II Floppy Disk Subsystem , often spelled as Disk , was a 5 inch Floppy disk floppy disk drive designed by Steve Wozniak and manufactured by Apple ... for 595 including the Disk controller controller card which can control up to two drives and cable. The Disk II was designed specifically for use with the Apple II personal computer family to replace ... computer without an Apple IIe Card . Apple produced at least six variants of the basic 5 inch Disk II concept over the course of the Apple II series lifetime The Disk II, the Disk III, the DuoDisk, the Disk IIc, the UniDisk 5.25 and the Apple 5.25 Drive. While all of these drives look differently ... use the same low level disk format, and are all interchangeable with the use of simple adapters, consisting of no more then two plugs and some wires between them. Most DuoDisk drives, the Disk IIc, the UniDisk ... interchangeable. This is not the case with Apple s 3.5 drives, which use several different disk formats ... connector, and are not generally interchangeable. History Disk II Apple did not originally offer a disk ... York Times date 1997 09 01 ref The first Disk II drives A2M0003 sold were built using parts from ... Computer, Inc., Fall 1990 9 16. ref Normal storage capacity per disk side was 113.75kiB with DOS 3.2.1 and earlier 256 bytes per sector, 13 sectors per track, 35 tracks per side , or 140kiB with DOS ... 16 sectors per track . The 16 sector upgrade was introduced in 1980, it modified only the software and the controller card, not the drive itself. The Disk II drive mechanism and all other Apple II 5.25 ... for users to manually flip the disk to utilize the opposite side, after cutting a second ... than one disk side was shipped on such flippy disks as well. Only one side could be accessed at once ... in the early years, when the media was still quite expensive. In the Disk II, the full height ... any disk inserted into it as soon as it starts spinning, even write protected disks such as those ... more details
Image GParted.png thumb 300px GParted is a popular utility used for disk partitioning Disk partitioning is the act of dividing a hard disk drive into multiple logical storage units referred to as partitions , to treat one physical disk drive as if it were multiple disks. Partitions are also termed slice disk slices for operating systems based on BSD , Solaris operating system Solaris or GNU Hurd . A partition ... on the hard disk. Benefits of multiple partitions Creating more than one partition has the following ... disk image image backup s or disk cloning clones to be made of only the operating system and installed ... on different partitions of the same hard disk and have a choice of booting into any compatible ... unbootable due to virus or single disk error in a critical windows file can be rescued without loosing ... on different disk locations, which practically can t get all corrupted at the same time. Also, the chance ... just creating a partition lesser size than available on the disk. For example a 1 TB disk might ... the following disadvantages, as compared to having a single partition spanning the same disk area Reduces the total space available for user storage on the disk, as it forces the operating system to duplicate certain file system administration areas on the disk for each partition. Reduces overall disk ... it forces the disk s read write head to move back and forth on the disk to access data on each ... on each partition. It also prevents disk optimizers from moving all frequently accessed files closer to each other on the disk, which could reduce the number and distance of required head movements. Files ... be far apart on the disk. See short stroking considerations above. This issue does not apply to Solid state drive s as access times on those are neither affected by nor dependent upon relative sector positions. Increases disk fragmentation because it lowers the average size of continuous free blocks ... of data has been written to them. May prevent using the whole disk capacity, because it may break ... more details
Orphan date April 2012 Please leave this line alone Disk Expert Disk Expert is a shareware Disk space analyzer disk usage analysis , reporting and processing utility for Mac OS X . ref name Download Disk Expert 1.0.1 from Softpedia Functionality Disk Expert scans the volumes of hard drive ref name Video review of Disk Expert and visually displays the disk space usage as a sunburst diagram. ref name Disk Expert Key Features The utility discovers the bulkiest content ref name Download Disk Expert from ... Disk Expert from OneDayOneApp The user can manage the disk content by picking up files into the special list ref name Disk Expert review by LowEndMac from which he can copy or move them to other drives ..., as well as reveal file in Finder . History Disk Expert was developed by Nektony LLC. It is a software ... speed of the disk scanning process was critical for the utility developers. Also the big attention was paid to Usability interface usability . The application was released on Dec 24, 2011. ref name Disk Expert Release References Reflist refs ref name Disk Expert Release http www.macnews.com 2011 12 22 nektony disk expert new disk space manager mac Disk Expert 1.0 Released ref ref name Disk Expert Key Features http nektony.com disk expert Disk Expert Key Features ref ref name Download Disk Expert from MacUpdate http www.macupdate.com app mac 41199 disk expert Download Disk Expert for Mac. MacUpdate ref ref name Download Disk Expert from OneDayOneApp http mac.onedayoneapp.com ?s disk expert&submit Search Disk Expert featured as Today s Mac App. OneDayOneApp ref ref name Video review of Disk Expert http www.bestmacsoftware.net maintenance review of nektonys disk expert Video review of Disk Expert. Best Mac Software ref ref name Disk Expert review by LowEndMac http lowendmac.com practical 12sw disk expert.html Disk Expert review. LowEndMac ref ref name Download Disk Expert 1.0.1 from Softpedia http mac.softpedia.com get Utilities Disk Expert.shtml Download Disk Expert 1.0.1. Softpedia ... more details
Disk cache may refer to Disk buffer , the small amount of buffer memory present on a hard drive. Page cache , the cache of disk pages kept by the operating systems, stored in unused main memory. General application level cache computing caching of data stored on the disk. disambig ko zh ... more details
refimprove date March 2011 The Disk Fax was a machine that was used in combination with games for the Family Computer Disk System in Japan. One of the main features of the Disk System is the ability to save data, allowing players to save information such as high score s and other achievements on their game disk. Disk Fax machines could be found in certain stores in Japan during the late 80s early 90s. The Disk Fax machines read save data and send the scores to Nintendo for inclusion on a national scoreboard. Disk Fax machines were used by Nintendo to hold contests in Japan. References http www.atarihq.com tsr fds fds.html tsr s NES archive Family Computer Disk System Nintendo hardware NES Category Nintendo hardware Category Japan only video game hardware Nintendo stub ... more details
In computing , a disk failure usually refers to the failure of a disc based storage device. These are usually either A floppy disk See buzz of death A hard disk See hard disk failure See also Fault tolerant system RAID Data redundancy Disaster recovery Data recovery Data loss Not to be confused with Spinal disc herniation Slipped disk a medical condition of a spine. disambig ... more details
Disk aggregation is the process of combining more than one logical or physical disk drive into a larger logical disk drive. This is done for various reasons creating a single logical disk with a capacity larger than any of the available physical disks providing a simple way to increase disk performance a simple way to implement LUN level storage virtualization See also RAID Storage Virtualization Sources Unreferenced date February 2007 compu storage stub Category Storage virtualization ... more details
Orphan date December 2010 Unreferenced date December 2009 merge cartridge electronics date March 2012 Disk cartridge has several meanings related to computer storage . 1960s storage medium An early disk cartridge was a single hard disk platter encased in a protective plastic shell. When the removable cartridge was inserted into the cartridge drive peripheral device , the disk read and write head read write head s of the drive could access the magnetic data storage device data storage surface of the platter through holes in the shell. The disk cartridge was a direct evolution from the disk pack drive, or the early hard drive . As the computer storage density storage density improved, even a single platter would provide a useful amount of data storage space, with the benefit being easier to handle than a removable disk pack. An example of a cartridge drive is the IBM magnetic disk drives IBM 2310 IBM 2310 . Disk cartridges were made obsolete by floppy disk s. Expand section date June 2008 Modern storage medium Image Zip disc back.jpg thumb Zip disks are sometimes referred to as disk cartridges. Some more recent removable disk storage media are referred to as disk cartridges . This is most common with Zip drive Zip disk s. It is very rare, but not unheard of, to refer to the floppy disk 3 inch microfloppy as a disk cartridge. Protective casing Some types of optical disc s and magneto optical disc s were either permanently enclosed in a protective plastic sheath, or placed into a sheath before being inserted into the computer drive drive . This sheath was often called caddy , but sometimes also disk cartridge . See also Cartridge electronics Universal Media Disc DEFAULTSORT Disk Cartridge Category Rotating disc computer storage media ... more details
Infobox software name Disk Utility logo Image Diskutil.png 64px screenshot Image Disk Utility screenshot.png 220px Disk Utility screenshot caption author developer Apple Inc. released latest release version ... website Disk Utility is the name of a Utility software utility created by Apple Inc. Apple for performing Disk storage disk related tasks in Mac OS X . These tasks include ref http docs.info.apple.com article.html?path DiskUtility 10.5 en duh1008.html Disk Utility 10.5 Help Testing and repairing a disk or volume ref the creation, conversion, compression and encryption of disk image s from a wide range of formats read by Disk Utility to .dmg or for CD DVD images .cdr Mount computing mount ing, unmounting, and ejecting disks including both hard disk s, removable media and disk images enabling or disabling Journaling file system journaling verifying a disk s Data corruption integrity , and repairing it if the disk is damaged this will work for both Mac compatible format partitions, and FAT32 ... ref http support.apple.com kb HT1452 About Disk Utility s Repair Disk Permissions feature ref disk erasing, disk formatting formatting , disk partitioning partitioning ref http support.apple.com kb HT2374 Mac OS X 10.5 About resizing disk partitions ref and disk cloning cloning secure deletion of free space or disk using a zero out data, a 7 pass NISPOM DOD 5220 22 M standard, or a 35 pass Gutmann ... Mac OS X How to combine RAID sets in Disk Utility ref , and repairing RAID sets restoring volumes from Apple Software Restore ASR images Optical disc authoring burning disk images to CD ROM CD or DVD in HFS Plus HFS format ref http support.apple.com kb HT2087 Burning a disk image file on a CD or DVD ... Technology S.M.A.R.T status of a hard disk. Disk Utility functions may also be accessed from ... commands. Disk Utility was updated with Mac OS X v10.3 . Prior to v10.3, the functionality of Disk Utility was spread across two applications Disk Copy and Disk Utility. Disk Copy was used for creating ... more details
and size of the boot sector perhaps corresponding to a logical disksector is specified by the design ... bootloader from another location on the disk. Furthermore, whatever is stored in the first sector of a floppy diskette, USB device, hard disk or any other bootable storage device, is not required ... date November 2007 Expert subject Computing date June 2011 A boot sector or boot block is a region of a hard disk , floppy disk , optical disc , or other data storage device that contains machine ... of a boot sector is to allow the booting boot process of a computer to load a computer program ..., then copies the first sector from the device which may be a Master Boot Record MBR , Volume Boot Record ... of a boot sector on other types of computer systems. Kinds of boot sectors Several major kinds of boot sectors could be encountered on IBM PC compatible hard disk s, floppy disk s and similar storage devices A master boot record MBR is the first sector of a data storage device that has been partition computing partitioned . The MBR sector may contain code to locate the active partition and invoke its Volume Boot Record. A volume boot record VBR is the first sector of a data storage device that has not been partitioned, or the first sector of an individual partition on a data storage device that has ... program installed on that device or within that partition. To be a valid boot sector, the two byte hexadecimal sequence 0x55, 0xAA called the boot sector signature must exist at the end of the sector ... CD ROM standard El Torito specifications . Non IBM PC compatible systems may have different boot sector formats on their disk devices. Operation details Booting On IBM PC compatible machines, the BIOS ... and runs the first sector of the storage device. ref http www.ibm.com developerworks linux library .... If the device is a hard disk, that will be an MBR. It is the code in the MBR which generally understands disk partitioning, and in turn, is responsible for loading and running the VBR ... more details
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