D - Definitions

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  • D

    D2D2C (disk-to-disk-to-cloud)

    D2D2C (disk-to-disk-to-cloud) is an approach to hybrid cloud backup that involves using local storage for staging data that will eventually be sent to a third-part cloud storage service provider.

  • DASD (direct access storage device)

    Direct access storage device (DASD, pronounced DAZ-dee), is a general term for magnetic disk storage devices. The term has historically been used in the mainframe and minicomputer (mid-range computer) environments.

  • DAT USB drive

    A DAT USB drive is a tape drive with digital audio tape (DAT) that can be plugged into a Universal Serial Bus (USB) connection as a simple and relatively low-cost way to back up data routinely, especially on servers. DAT USB technology is expected to make it easier and more affordable for small and medium-size businesses, as well as for larger enterprise data centers, to perform backup and restore operations.

  • data at rest

    Data at rest is a term that is sometimes used to refer to all data in computer storage while excluding data that is traversing a network or temporarily residing in computer memory to be read or updated.

  • data availability

    Data availability is a term used by some computer storage manufacturers and storage service providers (SSPs) to describe products and services that ensure that data continues to be available at a required level of performance in situations ranging from normal through "disastrous.

  • data center migration plan

    A data center migration plan is a strategy created by an organization to migrate a data center with minimal downtime.

  • data compression

    Data compression is a reduction in the number of bits needed to represent data.

  • data deduplication

    Data deduplication -- often called intelligent compression or single-instance storage -- is a process that eliminates redundant copies of data and reduces storage overhead.

  • data destruction

    Data destruction is the process of destroying data stored on tapes, hard disks and other forms of electronic media so that it is completely unreadable and cannot be accessed or used for unauthorized purposes.

  • Data Dynamics StorageX

    Data Dynamics StorageX is a software suite that specializes in data migration and Microsoft Distributed File System management.

  • data life cycle management (DLM)

    Data life cycle management (DLM) is a policy-based approach to managing the flow of an information system's data throughout its life cycle: from creation and initial storage to the time when it becomes obsolete and is deleted.

  • data management platform (DMP)

    A data management platform (DMP), also referred to as a unified data management platform (UDMP), is a centralized system for collecting and analyzing large sets of data originating from disparate sources.

  • data migration

    Data migration is the process of transferring data between data storage systems, data formats or computer systems.

  • data reduction in primary storage (DRIPS)

    Data reduction in primary storage (DRIPS) is the application of capacity optimization techniques for data that is in active use.

  • data retention

    Data retention, also called records retention, is the continued storage of an organization's data for compliance or business reasons. 

  • data storage

    Data storage is the collective methods and technologies that capture and retain digital information on electromagnetic, optical or silicon-based storage media.

  • Datera Inc.

    Datera created Elastic Data Fabric, a block storage platform aimed at cloud service providers and enterprises that want to build a private cloud on premises.

  • 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

    A dedicated cloud is a single-tenant cloud infrastructure, which essentially acts as an isolated, single-tenant public cloud.

  • 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)

    DIMM (dual in-line memory module) is a type of computer memory that is natively 64 bits, enabling fast data transfer.

  • 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 connected to one computer and not accessible to other computers.

  • disk array

    A disk array, also called a storage array, is a data storage system used for block-based storage, file-based storage or object storage.

  • 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 type of semiconductor memory that is typically used for the data or program code needed by a computer processor to function.

  • 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.

  • DVD-Audio (DVD-A)

    DVD-Audio (DVD-A) is a Digital Versatile Disc (DVD) format, developed by Panasonic, that is specifically designed to hold audio data, and particularly, high-quality music.

  • DVD-RAM

    DVD-RAM is a DVD(optical disc) technology for high-capacity data storage for computers.

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