Storage Technology Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing storage and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • D

    disk cache

    A disk cache is a mechanism for improving the time it takes to read from or write to a hard disk.

  • disk duplexing

    Disk duplexing is a variation of disk mirroring in which each of multiple storage disks has its own SCSI controller.

  • disk mirroring (RAID 1)

    RAID 1 is one of the most common RAID levels and the most reliable. Data is written to two places simultaneously, so if one disk fails, the other can be used to retrieve data.

  • disk striping

    Disk striping divides data into blocks and spreads the blocks across hard disks or solid-state drives to accelerate read and write access.

  • disk-to-disk-to-tape (D2D2T)

    Disk-to-disk-to-tape (D2D2T) is an approach to computer storage backup and archiving in which data is initially copied to backup storage on a disk and then later on copied again to tape.

  • diskette (floppy disk)

    A diskette is a random access, removable data storage medium that can be used with personal computers.

  • Double-Density Compact Disk (DDCD)

    Double-Density Compact Disk (DDCD) is a CD format that increases the storage capacity of the disk through means such as increasing the number of tracks and pits (scores on the disk that are used to encode the data).

  • double-parity RAID

    Double-parity RAID (redundant array of independent disks), also called diagonal-parity RAID, Advanced Data Guarding (RAID_ADG), or RAID-6, is a method of protecting against multiple storage drive failures by creating two sets of parity data on an array of hard disks.

  • DRAM (dynamic random access memory)

    Dynamic random access memory (DRAM) is a common type of random access memory (RAM) used in personal computers, workstations and servers.

  • DRDRAM (Rambus Dynamic Random Access Memory)

    RDRAM (Rambus Dynamic Random Access Memory) is a memory subsystem that promises to transfer up to 1.6 billion bytes per second.

  • driver

    A driver is a program that interacts with a particular device or special (frequently optional) kind of software.

  • dropout

    A dropout is a small loss of data in an audio or video file on tape or disk.

  • dual-layer magnetic tape (dual-side magnetic tape)

    Dual-layer magnetic tape, also known as dual-side magnetic tape, is a high-density storage medium capable of holding far more data than conventional tape backup... (Continued)

  • DVD (digital video disk)

    DVD is an optical disc technology with a 4.7 gigabyte storage capacity on a single-sided, one-layered disk, which is enough for a 133-minute movie.

  • DVD Forum

    The DVD Forum is an international organization made up of companies using or manufacturing digital versatile disc (DVD)-related products.

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