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

    DDR SDRAM (double data rate SDRAM)

    DDR SDRAM (double data rate SDRAM) is synchronous dynamic RAM (SDRAM) that can theoretically improve memory clock speed to at least 200 MHz*. It activates output on both the rising and falling edge of the system clock rather than on just the rising edge, potentially doubling output.

  • Dedicated Cloud

    Dedicated Cloud is a cloud service model available in VMware's vCloud Hybrid Service.

  • deep archive

    A deep archive is a type of data archiving that refers to a storage location for data that will likely never be accessed again, but can't be deleted.

  • defragmenter

    A defragmenter is a software utility that rearranges the fragments or discontiguous parts of each file stored on a computer hard disk so that the small, empty storage spaces adjacent to fragments can be used, effectively creating new storage space and possibly making file access faster.

  • Dell EMC Federation Enterprise Hybrid Cloud

    Federation Enterprise Hybrid Cloud is a reference architecture that uses technologies from Dell EMC's Federation to integrate public and private clouds.

  • Dell EMC World

    Dell EMC World is an annual event for Dell EMC customers that showcases new and emerging technologies in the virtualization, cloud and data storage market.

  • Dell EqualLogic

    Dell EqualLogic storage-area network arrays provide varying capacities of hard disk drives and solid-state drives using iSCSI and SATA controllers.

  • delta differencing

    Delta differencing is an incremental approach to backup that only backs up blocks that have changed after the first full backup. The differences are recorded in files called deltas.

  • depository

    A depository is a file or set of files in which data is stored for the purpose of safekeeping or identity authentication.

  • desktop NAS

    Desktop NAS (network-attached storage) is a device that stores and serves the file-level data of networked computers.

  • digital film

    Digital film is any storage medium (such as a memory card, diskette, or recordable CD) used in a digital camera to capture and store images.

  • DIMM (dual in-line memory module)

    A DIMM (dual in-line memory module) is the standard memory card used in servers and PCs.

  • direct access

    In computer storage, direct access is the ability to obtain data from a storage device by going directly to where it is physically located on the device rather than by having to sequentially look for the data at one physical location after another.

  • direct-attached storage (DAS)

    Direct-attached storage (DAS) is computer storage that is directly attached to one computer or server and is not, without special support, directly accessible to other ones.

  • disk cache

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

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