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Related to disk: disc


1. The two-dimensional projection of the surface of a star or planet.
2. See Galaxy; galaxies.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006


A flat, circular, raised ornament, carved as a series of disks adjacent to each other.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


Also spelled disc.
A relatively thin layer of material distributed in the central plane of a spiral galaxy, in contrast to the nucleus or halo.
Any of various rounded and flattened animal and plant structures.
(computer science)
A rotating circular plate having a magnetizable surface on which information may be stored as a pattern of polarized spots on concentric recording tracks. Also known as magnetic disk.
(engineering acoustics)
The region in the plane consisting of all points with norm less than 1 (sometimes less than or equal to 1).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. magnetic disk.

2. compact disc.

3. optical disk.

Note: the american spelling, "disk", is normal for most computer disks whereas "compact disc", having come to computers via the audio world, is correctly spelled with a "c", indeed, this spelling is part of the CD standard.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


A storage device that uses rotating platters divided into sectors that hold a fixed amount of data. The sectors are stored in tracks that are recorded in concentric circles on the platter. When a sector is read or written, a mechanical access arm moves to the required track (see access arm).

Invented in the 1950s and the primary storage medium since the 1970s, the disk has slowly but surely given way to solid state drives (SSDs) that have no mechanical parts. See sector, hard disk, magnetic disk, SSD, optical disc, CD-ROM, DVD, floppy disk, RAMAC and DASD.

Disk and Memory Work Together
On the disk, data are stored in sectors, which hold a chunk of data (typically 4,096 bytes) and are the smallest unit that can be read or written. Memory (RAM) is like a checkerboard, each square holding one byte. In RAM, the contents of any single byte or group of bytes can be calculated, compared and copied independently. See storage vs. memory and byte addressable.
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References in periodicals archive ?
Inherent issues with tape--in particular, issues with data streaming (on the backup side) and multiplexing (on the restore side), as well as ongoing issues with drive and media reliability, and the increasing affordability and availability of SATA-based disk backup options, have led many users recently to re-evaluate their existing backup and recovery procedures and implement disk--either as virtual tape, as a disk backup/recovery target, or as a host-based option.
With this technology, documents can be digitized, indexed and stored on disk. Further references to the stored information are made using a high-resolution display screen.
Had the black hole been rotating any slower, it couldn't have whipped nearby space-time into quite as strong a tornado, and the inner part of the accretion disk couldn't have extended quite so close to the event horizon--the boundary between the black hole's maw and the outside world.
Consolidated archive involves archiving data that meets corporate archival policy from remote systems to a central disk. Archival policy determines what data is to be archived, and when, as well as parameters, including last date accessed, file type, content, location, ownership, and file size.
The HD 142527 disk isn't the first to defy the standard disk shape.
- A 3D acceleration sensor automatically perceives when the unit has been dropped and shuts off the power to protect the hard disk.
Disk storage elements range from 3.8 to 46.8 TB capacity; tape storage is provided by integrating ADIC Scalar and StorageTek L-Series libraries.
Some RAID subsystems allow a technician to remove a failing hard disk drive without shutting down a server.
A 20-Mb file, for example, will take only about 10 Mb of space on your hard disk. These programs all work in essentially the same way: They look for redundant instructions in the software application, index that code and then replace a long programming code with a short index code.
So, this week, I gave the Dell desktop and the IBM Thinkpad to my colleagues and I bought a Compaq LTE 5200 with an active matrix color monitor, 120 MHz Pentium processor, 1.35 gigabyte disk drive, a removable 4 speed CD ROM drive, a 28,800 baud fax-modem, a PCMCIA 10BaseT ethernet adapter, and 75 megabytes of RAM.
With an optical-disk jukebox system, the data can be downloaded from the computer to an optical disk overnight, freeing the expensive hard disk storage of the main computer for daily transactions.