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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 ?
Affordable equipment can store and retrieve thousands of monochrome or color video pictures on magnetic or optical storage disks.
The bearing and the read-write head move at acceleration rates up to 50 gs on a slender air cushion (only 50 nanometers thick) above the storage disk surface.
Following the movement from "Industrial Automation" to "Smart Factories," and with flexible manufacturing and a tight IT budget in mind, MemxPro makes available storage disk data to help customers efficiently conduct detailed data analysis to help streamline their business.
A stream of gas flows from the normal star and enters into a storage disk around the black hole.
The storage disk systems are the foundation of Sun's Open Storage strategy that enables customers to use open source software with commodity storage hardware to achieve flexibility, performance and cost savings.
The company is an investor in and manufactures photopolymers for InPhase Technologies' holographic data storage medium, the first holographic data storage disk on the commercial market which was launched in May (see HN Vol 22, No 6).
Corigin, a global provider of mainframe data access software solutions, has introduced a breakthrough technology for direct native FICON access to data on mainframe storage disk from heterogeneous Open Systems platforms.
In other words, the 8Gb/s Fibre Channel speeds between the disk drives on a Fibre Channel Arbitrated Loop (FC--AL) all within a storage disk array.
Hitachi Data Systems Inc has built new technology into its 7700E Freedom Storage disk arrays that offers what it claims is the first point-in-time copying facility for large amounts of data not to disrupt applications.
Recently the first commercial holographic data storage disk was launched, an expensive product with multi-terabyte capacity, to be used by a relatively few organisations with the need for, and resources to buy, high-capacity, rapid-access data storage.
Most commonly, the box is inserted between the fabric and the storage disk array or tape library.
One of the sample architectures ICL laid out involved using a three-tier system with a layer of Intel-based servers attached to a server and storage disk layer.