Image Airy pattern.svg thumb Computer generated image of an Airydisk . The gray scale intensities have ... thumb Surface plot of intensity in an Airydisk . In optics , the Airydisk or Airy disc and Airy pattern ... a uniformly illuminated circular aperture has a bright region in the center, known as the Airydisk ... are named after George Biddell Airy . The disk and rings phenomenon had been known prior to Airy John ... a lens or mirror can focus a beam of light is the size of the Airydisk. Even if one were able ... by diffraction is said to be diffraction limited . The Airydisk is of importance in physics , optics ..., is that the center of the Airydisk for the first object occurs at the first minimum of the Airy ... described as the radius of the Airydisk depends only on wavelength and aperture size, the appearance ... wavelength and seen through a given aperture have the same Airydisk radius characterized by the above .... 5 , 1835, p. 288. ref blockquote Despite this feature of Airy s work, the radius of the Airydisk ... is a limiting value for the size of the Airydisk, and not a definite radius. Citation needed date ... focused by a lens will form an Airydisk pattern at the focus. The size of the Airydisk determines ... Airydisk where math J 1 x x 2 sqrt 2 math occurs at math x 1.61633... math the 1 e sup ... at the center of the Airydisk. The expression for math I theta math above can be integrated ... an imaging system as diffraction limited if the Airydisk radius is larger than the RMS spotsize ... disk is about one third that of the Airydisk radius, i.e. math 0.42 lambda N math as opposed to math ... diffraction Optical unit Point spread function Strehl ratio Light bloom , the effect of the Airydisk ... the above formula. http www.oldham optical.co.uk Airy 20Disk.htm The AiryDisk An Explanation Of What It Is, And Why You Can t Avoid It , Oldham Optical UK . DEFAULTSORT AiryDisk Category Physical ... it Disco di Airy he nl Airy schijf ja pl Plamka Airy ego sl Airyjev disk tr ... more details
wiktionary airyAiry may refer to Sir George Biddell Airy 1801 1892 , British Astronomer Royal from 1835 to 1881, for whom the following features, phenomena, and theories are named Airy lunar crater Airy Martian crater Airy 0 , a smaller crater within the previous one on Mars, and which defines the prime meridian of the planet Airy wave theory , a linear theory describing the propagation of gravity waves on the surface of a fluid Airydisk , a diffraction pattern in optics Airy beam , a non spreading, transversely accelerating optical wavepacket Airy function , a mathematical function Airy points , support points chosen to minimize the distortion of the length of a physical standard such as the International Prototype Meter See also Airey disambiguation Mount Airy disambiguation disambiguation bg cs Airy de Airy es Airy cr ter fr Airy ko it Airy ja pt Airy sk Airy ... 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
Mount Airy is the name of several places in the United States of America Mount Airy, Georgia Mount Airy, Louisiana Mount Airy, Maryland Mount Airy Davidsonville, Maryland , listed on the NRHP in Maryland Mount Airy Sharpsburg, Maryland , listed on the NRHP in Maryland Mount Airy, Nevada Mount Airy, New Jersey Mount Airy, New York Mount Airy, North Carolina Mount Airy, Ohio Mount Airy, Philadelphia , a neighborhood within the city of Philadelphia, Pennsylvania Mount Airy, Virginia disambiguation , the name of several places in Virginia Mount Airy Leesville, Virginia , List of RHPs in VA listed on the NRHP in Virginia Mount Airy Warsaw, Virginia , List of RHPs in VA listed on the NRHP in Virginia Mount Airy may also refer to a place in Clarion County, Pennsylvania two places in Lancaster County, Pennsylvania a place in Pickett County, Tennessee a place in Sequatchie County, Tennessee a casino resort in Mount Pocono, Pennsylvania, the Mount Airy Casino Resort disambig Category Place name disambiguation pages de Mount Airy it Mount Airy nl Mount Airy pl Mount Airy pt Mount Airy vo Mount Airy ... more details
orphan date September 2010 An Airy beam is a non diffracting waveform which gives the appearance of curving as it travels. Physical Description A cross section of an Airy beam would reveal an area of principal intensity, with a series of adjacent, less luminous areas trailing off to infinity. In real applications, the beam is truncated so as to have a finite composition. As the beam propagates, it does not diffract, i.e., does not spread out. The Airy beam also has the characteristic of freely accelerating. As it propagates, it bends so as to form a parabolic arc. History The term Airy beam derives from the Airy integral, developed in the 1830s by Sir George Biddell Airy to explain optical caustics such as those appearing in a rainbow. ref name physorg.com http www.physorg.com news115556629.html Scientists make first observation of Airy optical beams ref The Airy waveform was first theorized in 1979 by M. V. Berry and N. L. Balz. They demonstrated a nonspreading Airy wave packet solution to the Schr dinger equation. ref http www.aims.ac.za resources 2003 courses mberry the 20papers BERRY078.PDF Nonspreading wave packets ref In 2007 researchers from the University of Central Florida were able to create and observe an Airy beam for the first time in both one and two dimensional configurations ... Airy nondispersive solution ref http scitation.aip.org getabs servlet GetabsServlet?prog normal&id PRLTAO000099000021213901000001&idtype cvips&gifs yes Observation of Accelerating Airy Beams ref math Phi xi, ,s Ai ,s xi 2 2 exp i ,s xi 2 i xi 3 12 math where math Ai math is the airy function .... successfully fabricated an Airy beam in 2007. A beam with a Gaussian distribution was modulated by a spatial light modulator to have an Airy distribution. The result was recorded by a CCD camera . ref name physorg.com Applications Researchers at the University of St. Andrews have used Airy beams to manipulate ... throws a curve ball ref See also Bessel beam Notes and references reflist 2 DEFAULTSORT Airy Beam ... more details
Airy Points are used for precision measurement metrology to support a length standard in such a way as to minimise bending or droop. The points are symmetrically arranged around the centre of the length standard and are separated by a distance equal to math 1 sqrt 3 0.577... math or about approximately 5 9ths of the total length of the measuring device. Airy points are normally identified by inscribed marks or lines. For example, a 450 mm length gauge would have an Airy point separation of 450 mm times 5 9 250 mm. A line or pair of lines would be marked onto the gauge 100 mm in from each end. Supporting the artifact at these points ensures that the calibrated length is preserved. If the length gauge is not supported at the Airy points, the measurement uncertainty is increased. See also George Biddell Airy History of measurement International Prototype Meter Test method Units of measurement Uncertainty in measurement Weights and measures References Smith, S. T. and D. G. Chetwynd. 1994. Developments in Nanotechnology Vol. 2 Foundations of Ultraprecision Mechanism Design . Taylor & Francis. p. 323 of 364. ISBN 9782884490016 Phelps, F. M. 1966. Airy Points of a Meter Bar . Amer. J. Physics 34 5 419 422. http jartweb.net thesis AppendixC.pdf Appendix c flexing of length bars Category Metrology Sci stub ... more details
about the Airy special function the Airy stress function employed in solid mechanics Stress functions In the physical sciences, the Airy function Ai x is a special function named after the British astronomer George Biddell Airy 1801 92 . The function Ai x and the related function Bi x , which is also called the Airy function , but sometimes referred to as the Bairy function, are solutions to the differential equation math frac d 2y dx 2 xy 0 , , math known as the Airy equation or the Stokes equation ... the character of the solutions changes from oscillatory to exponential . The Airy function is the solution ... is directly relevant for the understanding of many semiconductor devices. The Airy function also ... . Historically, this was the mathematical problem that led Airy to develop this special function. The Airy function is also important in microscopy and astronomy it describes the pattern ... than the resolution limit of a microscope or telescope . Definitions Image Airy Functions.svg right thumb 400px Plot of Ai x in red and Bi x in blue. For real values of x , the Airy function is defined ... for the other solution is the Airy function of the second kind, denoted Bi x . It is defined as the solution ... by the asymptotic formulae below for the Airy functions. The Airy functions are orthogonal ... Ai t x mathrm Ai t y dt delta x y . math Asymptotic formulae The asymptotic behaviour of the Airy ... and Stegun, 1954 and Olver, 1974 . Complex arguments We can extend the definition of the Airy function ... x are valid if x is in the sector x C arg x 2 3 . It follows from the asymptotic behaviour of the Airy ... 200px Relation to other special functions For positive arguments, the Airy functions are related to the Bessel ... sub 1 3 sub are solutions of math x 2y xy x 2 1 9 y 0 math . The first derivative of Airy function ..., the Airy function are related to the Bessel function s math begin align mathrm Ai x & frac13 ... the equation math y xy 1 pi math . They can also be expressed in terms of the Airy functions math begin ... more details
Airy Castle is a village in the Jamaica n parish of Saint Thomas, Jamaica Saint Thomas . Settlements in Jamaica coord 17 55 N 76 20 W display title region JM type city source GNS enwiki Category Populated places in Jamaica Category Saint Thomas Parish, Jamaica Jamaica geo stub ... more details
Anna Airy 1882 1964 was an oil painter, pastel artist and etcher , working in Britain. She was born in Greenwich , London , daughter of engineer Wilfrid Airy and Anna n e Listing, and granddaughter of Astronomer Royal George Biddell Airy . She attended the Slade School of Fine Art in London, where she was taught by Henry Tonks and Philip Wilson Steer . She drew her subject matter from London criminals and lowlife . She published The Art of Pastel . ref Airy, Anna. Chambers Biographical Dictionary. London Chambers Harrap, 2007. Credo Reference. Web. 25 March 2010 ref Anna Airy was one of the first women officially commissioned as a war artist . ref name Independent cite web url http www.independent.co.uk arts entertainment art features women at war the female british artists who were written out of history 2264670.html title Women at war The female British artists who were written out of history date 8 April 2011 publisher Independent publisher Independent ref In June 1918 the Munitions Committee of the Imperial War Museum commissioned four paintings by Airy representing typical scenes in four munitions factories. These include A Shell Forge at a National Projectile Factory, Hackney Marshes, London 1918 , ref name IWM WWA cite web url http london.iwm.org.uk server show ConGallery.130 title Women War Artists publisher Imperial War Museum ref featured in the Museum s 2011 2012 exhibition Women War Artists . ref name IWM 2011 04 cite web url http www.iwm.org.uk server show ConWebDoc.7165 title Press Desk Women War Artists date 7 April 2011 publisher Imperial War Museum ref Bibliography cite web title Founding of Orwell Park Observatory author Goward, K. J. year 2006 url http www.ast.cam.ac.uk ipswich Observatory Founding.htm work Institute of Astronomy publisher University of Cambridge ... Persondata NAME Airy, Anna ALTERNATIVE NAMES SHORT DESCRIPTION Painter, etcher DATE OF BIRTH 1882 PLACE OF BIRTH DATE OF DEATH 1964 PLACE OF DEATH DEFAULTSORT Airy, Anna Category British etchers ... more details
The Airy Glacier coord 69 13 S 66 20 W type glacier region AQ display inline,title is a glacier convert 20 miles long and convert 6 mi 0 wide, flowing west to the northeast portion of Forster Ice Piedmont , near the west coast of the Antarctic Peninsula . The glacier was first roughly surveyed by British Graham Land Expedition of 1936&ndash 37, then photographed from the air by the Ronne Antarctic Research Expedition in 1947, and surveyed by Falkland Islands Dependencies Survey in 1958. It was named by United Kingdom Antarctic Place Names Committee for George Biddell Airy , British Astronomer Royal , who in 1839 introduced a method of correcting magnetic compass es for Magnetic deviation deviation . References usgs gazetteer id 157 Category Glaciers of Palmer Land PalmerLand geo stub ... more details
coord 39 38 40 N 77 25 16 W display title Infobox University name Camp Airy image name Camp airy logo.png image size caption Serving Jewish Youth For Over 80 Summers motto tagline established 1924 type Overnight Camp endowment staff head label Camp Director head Rick Frankle students city Thurmont, Maryland Thurmont state Maryland country United States campus convert 450 acre km2 free label free colors ... Camp Airy Louise website address 14938 Old Camp Airy Road br Thurmont, MD 21788 publictransit telephone 301 271 4636 coor coord 39 38 40 N 77 25 16 W type mountain region US logo Camp Airy is a Jewish ... on their age and interest. Airy is a member of the American Camp Association . Facilities Located on 450 ... hockey rink, and a ropes course . ref name fac http www.airylouise.org airy facilities.asp Facilities at Camps Airy & Louise Bot generated title ref At the top of the hill, there s a 550 seat dining ... for performing arts and also for Shabbat services. ref name fac Programming Airy offers many ... arts. ref http www.petersons.com summerop sites 016984si.asp Camp Airy Overview Peterson s Bot ... a comedy. In 2009, the campers of Camp Airy performed Fools play Fools starring Zach Lucky Richman ... New Programs at Camps Airy & Louise Bot generated title ref . Religious aspects Although Airy ... One of the most prized assets of Airy are the people who work there. Many of these people are referred to as Lifers . For Airy, this includes persons such as Rick Frankle, Doctors Danny and David Framm ... of Camp Airy, most can be found on the hill each and every season. Rick Frankle is the current ... Members at Camps Airy & Louise Bot generated title ref The http orderoftheleaf.org Order Of The Leaf ... of America holds camp at Airy in late August. In exchange for use of the facility, the scouts clean and shut the camp down for the winter. As of 1994, Camp Airy BSA is an accredited camp of the National .... References references MD Camp Facilities Category Jewish summer camps in Maryland Airy ... more details
Infobox NRHP name Airy Hill nrhp type image caption nearest city Chestertown, Maryland lat degrees 39 lat minutes 11 lat seconds 34 lat direction N long degrees 76 long minutes 5 long seconds 36 long direction W locmapin Maryland area architect architecture Federal added December 30, 1996 governing body Private refnum 96001478 ref name nris NRISref 2008a ref Airy Hill is a historic home located at Chestertown, Maryland Chestertown , Kent County, Maryland Kent County , Maryland , United States . It is a two section dwelling consisting of a frac 1 1 2 story frame wing and a two story Federal architecture Federal style brick house. The brick section was added in the early 1790s, together with a middle section that now connects the two. Also on the property is a brick smokehouse and an early 19th century cemetery. ref cite web url http mht.maryland.gov nr NRDetail.aspx?HDID 1184&COUNTY Kent&FROM NRCountyList.aspx?COUNTY Kent title Maryland Historical Trust date 2008 10 05 work National Register of Historic Places Airy Hill publisher Maryland Historical Trust ref Airy Hill was listed on the National Register of Historic Places in 1996. ref name nris References reflist External links http mht.maryland.gov nr NRDetail.aspx?HDID 1184&COUNTY Kent&FROM NRCountyList.aspx?COUNTY Kent Airy Hill, Kent County , including photo from 1996, at Maryland Historical Trust National Register of Historic Places in Maryland Category Houses on the National Register of Historic Places in Maryland Category Houses in Kent County, Maryland Category Federal architecture in Maryland Maryland NRHP stub ... more details
Use dmy dates date April 2012 Infobox military person name Sir Christopher Airy image caption birth date birth date and age 1934 03 08 df yes death date placeofburial label placeofburial birth place death place placeofburial coordinates coord LAT LONG display inline,title nickname allegiance flagicon United Kingdom United Kingdom branch Image Flag of the British Army.svg 23px British Army serviceyears 1954 1989 rank Major General United Kingdom Major General unit commands 1st Bn Scots Guards br 5th Field Force br London District British Army London District battles Operation Banner awards Knight Commander of the Royal Victorian Order br Commander of the Order of the British Empire relations laterwork Major General United Kingdom Major General Sir Christopher John Airy Royal Victorian Order KCVO Order of the British Empire CBE born 8 March 1934 was General Officer Commanding the Household Division and Major General Commanding London District British Army London District . Military career Educated at Marlborough College and the Royal Military College Sandhurst Sandhurst , ref http www.burkespeerage.com FamilyHomepage.aspx?FID 118 Burke s Peerage ref Airy was Commissioned officer commissioned into the Grenadier Guards in 1954. ref LondonGazette issue 40133 supp yes startpage 1875 date 26 March 1954 accessdate 5 June 2010 ref Airy became Personal Military Assistant to the Secretary of State for War in 1960, Deputy Assistant Adjutant General and Regimental Adjutant in 1967 and Brigade Major of 4th Guards Brigade in 1971. In 1974 he transferred to the Scots Guards in 1974 on appointment as Commanding Officer of the 1st Battalion of the Scots Guards . ref LondonGazette issue 46403 supp yes startpage 11380 date 18 November 1974 accessdate 5 June 2010 ref Two years later he became ... Sir John Riddell after Richard Aylard s end Persondata NAME Airy, Christopher ALTERNATIVE NAMES SHORT ... OF DEATH PLACE OF DEATH DEFAULTSORT Airy, Christopher Category 1934 births Category Living people ... 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
other uses2 Disc Unreferenced date December 2009 File CIRCLE 1.svg thumb A disk is the region bounded by a circle . An open disk is the interior topology interior of the disk excluding the bounding circle, while a closed disk see closed set is the open disk together with the bounding circle. In geometry , a disk also Spelling of disc spelled disc is the region in a plane geometry plane bounded by a circle . A disk is said to be closed or open according to whether or not it contains the circle that constitutes its boundary. In Cartesian coordinates , the open disk of center math a, b math and radius R is given by the formula math D x, y in mathbb R 2 x a 2 y b 2 R 2 math while the closed disk of the same center and radius is given by math overline D x, y in mathbb R 2 x a 2 y b 2 le R 2 . math The area geometry area of a closed or open disk of radius R is R sup 2 sup see pi . The Ball mathematics ball is the disk generalised to metric spaces . In context, the term ball may be used instead of disk . In theoretical physics a disk is a rigid body which is capable of participating in collisions in a two dimensional gas . Usually the disk is considered rigid so that collisions are deemed elastic collision elastic . Geometry The Euclidean disk is Circular symmetry circular symmetrical . Topological notions The open disk and the closed disk are not homeomorphic, since the latter is compact ... also that of a closed or open disk is 1. Every continuous map from the closed disk to itself ... disk consider for example math f x,y left frac x sqrt 1 y 2 2 ,y right math which maps every point of the open unit disk to another point of the open unit disk slightly to the right of the given one. See also Unit disk , a disk with radius one Annulus mathematics Ball mathematics , the usual term for the 3 dimensional diskDisk algebra Lentoid Moment of inertia of a uniform disc DEFAULTSORT Disk Mathematics Category Euclidean geometry Category Rigid bodies ar bs Krug ca Disc ... more details
Image Nashua diskpack.jpg thumb Disk pack manufactured by Nashua, USA, without its protective cover. A 3.5 modern hard drive is shown for comparison. A Disk pack is a layered grouping of hard disk platter s circular, rigid discs coated with a magnetic data storage device data storage surface . A disk pack is the core component of a hard disk drive. In modern hard disks, the disk pack is permanently sealed inside the drive. In many early hard disks, the disk pack was a removable unit, and would be supplied ... and a separate bottom that completed the sealed package. To remove the disk pack, the drive would ... shell inserted and twisted to unlock the disk platter from the drive and secure it to the top shell. The assembly would then be lifted out and the bottom cover attached. A different disk pack could then be inserted by removing the bottom and placing the disk pack with its top shell into the drive. Turning the handle would lock the disk pack in place and free the top shell for removal. The first removable disk pack was invented in 1965 by two IBM engineers, Thomas G. Leary and R. E. Pattison. The 14 ... vendors producing IBM compatible drives and disk packs. Examples of a hard disks with removable disk packs are the IBM magnetic disk drives IBM 1311 IBM 1311 , and the Digital Equipment Corporation Digital RP04. gallery File Fotothek df n 10 0000117.jpg Operator selects a disk pack File Fotothek df n 10 0000118.jpg Bottom cover is removed File Fotothek df n 10 0000119.jpg Disk pack is ready for insertion File IBM2314DiskDrivesAndIBM2540CardReaderPunch.jpg IBM 2314 s with removable disk packs and empty covers on top File Disk Pack.jpg A removable pack in place gallery References http www 03.ibm.com ... for Drum and Disk Records, U.S. Patent 3,206,214, 1965 R.E. Pattison, Portable Memory for Data Processing Machine, U.S. Patent 3,176,281, 1965 See also commons category Removable disk packs disk cartridge , History of hard disk drives DEFAULTSORT Disk Pack Category Rotating disc computer storage ... more details
An occulting disk is a small disk used in a telescope to block the view of a bright object in order to allow observation of a fainter one. The coronagraph , at its simplest, is an occulting disk in the focal plane of a telescope , or in front of the entrance aperture , that blocks out the image of the solar disk, so that the corona can be seen. Notes, References and Sources http www.daviddarling.info encyclopedia The Encyclopedia of Astrobiology, Astronomy, and Spaceflight astronomy stub Category Telescopes Category Optical devices de Kegelblende ... more details
Disk swapping refers to the practice of inserting and removing, or swapping, floppy disks in a floppy disk drive based computer system . In the early days of personal computer s, before hard drives became commonplace, most fully outfitted computer systems had 2 floppy drives addressed as A and B on CP M and MS DOS. Disk drives were expensive, however, and having two was seen as a luxury by many computer users who had to make to with a single drive. The purpose of 2 floppy drives was so that the disk containing the Application software application program could remain in the drive while the data disk containing the user s files could be accessed in the second drive. In order to use a function of the program not loaded into memory, the user would have to first remove the data disk, then insert the program disk. When the user then wanted to save their file, the reverse operation would have to be performed. On some less than user friendly systems, this could result in data loss when, for example, files were saved onto the program disk. Disk swapping was an infamous feature of early Macintosh 128k systems, which were extremely RAM starved. Category Floppy disk computer storage ... more details
Encyclopedia
top
