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.

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    3.5" SSD (3.5 solid-state drive)

    A 3.5 solid-state drive (SSD) is a data storage device designed for the 3.5-inch hard disk drive (HDD) form factor. It fits into the drive slot as a same-sized HDD in a portable computer, enterprise server, or storage system.

  • 3D NAND flash

    3D NAND is a type of non-volatile flash memory in which the memory cells are stacked vertically in multiple layers.

  • 3D XPoint

    3D XPoint is memory storage technology jointly developed by Intel and Micron Technology Inc. The two vendors have described this new technology as filling a gap in the storage market between dynamic RAM (DRAM) and NAND flash.

  • 8-track tape

    An 8-track tape is a hard plastic cartridge about the size of an external modem that houses a continuous loop of non-digital (analog) audio data stored on magnetic tape.

  • A

    access time

    Access time is the time from the start of one storage device access to the time when the next access can be started.

  • active archive

    An active archive is a collection of data that is too valuable for a company to discard, but only needs to be accessed occasionally.

  • address space

    Address space is the amount of memory allocated for all possible addresses for a computational entity, such as a device, a file, a server, or a networked computer.

  • AHCI (Advanced Host Controller Interface)

    Advanced Host Controller Interface, or AHCI, is a technical standard for an interface that enables software to communicate with Serial ATA (SATA) devices.

  • all-flash array (AFA)

    An all-flash array (AFA), also known as a solid-state storage disk system or a solid-state array, is an external storage array that uses only flash media for persistent storage.

  • application-aware storage

    Application-aware storage is a storage system with built-in intelligence about relevant applications and their utilization patterns.

  • archive

    An archive is a collection of data moved to a repository for long-term retention, to keep separate for compliance reasons or for moving off primary storage media.

  • areal density

    Areal density measures the amount of data that can be stored on a given amount of physical space on a disk drive.

  • automated storage tiering (AST)

    Automated storage tiering (AST) is a storage software management feature that dynamically moves information between different disk types and RAID levels to meet space, performance and cost requirements.

  • B

    bad block

    A bad block is an area of storage media that is no longer reliable for storing and retrieving data because it has been physically damaged or corrupted.

  • bare-metal cloud

    Bare-metal cloud is a public cloud service that offers dedicated hardware resources without any installed operating systems or virtualization infrastructure.

  • bare-metal restore

    A bare-metal restore (also referred to as bare-metal recovery or bare-metal backup) is a data recovery and restoration process where a computer is restored to a new machine, typically after a catastrophic failure.

  • big data storage

    Big data storage is a compute-and-storage architecture that collects and manages large data sets and enables real-time data analytics.

  • bit rot

    Bit rot is the slow deterioration in the performance and integrity of data stored on storage media. It is also known by the names bit decay, data rot, data decay and silent corruption.

  • block storage

    Block storage is an approach to data storage in which each storage volume acts as an individual hard drive that is configured by the storage administrator. In the block storage model, data is saved to the storage media in fixed-sized chunks called blocks.

  • blockchain storage

    Blockchain storage is a way of saving data in a decentralized network, which utilizes the unused hard disk space of users across the world to store files.

  • brontobyte

    A brontobyte is a measure of memory or data storage that is equal to 10 to the 27th power of bytes.

  • bus

    In a computer or on a network, a bus is a transmission path on which signals are dropped off or picked up at every device attached to the line.

  • business impact analysis (BIA)

    Business impact analysis (BIA) is a systematic process to determine and evaluate the potential effects of an interruption to critical business operations as a result of a disaster, accident or emergency.

  • byte

    In most computer systems, a byte is a unit of data that is eight binary digits long. Bytes are often used to represent a character such as a letter, number or typographic symbol.

  • C

    cache

    A cache -- pronounced CASH -- is hardware or software that is used to store something, usually data, temporarily in a computing environment.

  • cache algorithm

    A cache algorithm is a detailed list of instructions that decides which items should be discarded in a computer's cache of information.

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access more quickly than it can access regular random access memory (RAM).

  • capacity management

    Capacity management is the broad term describing a variety of IT monitoring, administration and planning actions that are taken to ensure that a computing infrastructure has adequate resources to handle current data processing requirements as well as the capacity to accommodate future loads.

  • Caringo Swarm

    Swarm is software designed to store unstructured data on an object storage platform. Unique indentifiers allow objects to be tracked using the search function.

  • Ceph

    Ceph is open source software providing scalable object-, block- and file-based storage under a unified system. Red Hat and SUSE sell commercially supported versions of Ceph.

  • charge-coupled device

    A charge-coupled device (CCD) is a light-sensitive integrated circuit that captures images by converting photons to electrons.

  • CIFS (Common Internet File System)

    CIFS (Common Internet File System) is a protocol that gained popularity around the year 2000, as vendors worked to establish an Internet Protocol-based file-sharing protocol.

  • client solid state drive (SSD)

    Client solid state drive (SSD) is a marketing term used by original equipment manufacturers (OEMs) and value-added resellers (VARs) to differentiate between solid state drives built for consumers and solid state drives built for the enterprise.

  • cloud archive

    A cloud archive is storage as a service for long-term data retention.

  • cloud computing maturity model (CCMM)

    A Cloud Computing Maturity Model (CCMM) is a model that defines and analyzes the progress of an organization’s ability to deliver cloud services in key areas such as capabilities, domains, maturity and adoption.

  • cloud controller

    A cloud controller is a device that moves data between on-premises storage and the cloud.

  • cloud data management

    Cloud data management is a way to manage data across cloud platforms, either with or instead of on-premises storage.

  • Cloud Data Management Interface

    Cloud Data Management Interface (CDMI) is a Storage Networking Industry Association (SNIA) industry standard that defines the interface that applications will use to create, retrieve, update and delete data elements from the cloud.

  • cloud encryption (cloud storage encryption)

    Cloud encryption is a service offered by cloud storage providers whereby a customer's data is transformed using encryption algorithms into ciphertext and stored in the cloud.

  • cloud file sharing

    Cloud file sharing is a method of allowing multiple users to access data within a public cloud, private cloud or hybrid cloud.

  • cloud file storage

    Cloud file storage is a storage service that is delivered over the Internet, billed on a pay-per-use basis and has an architecture based on common file level protocols such as Server Message Block (SMB), Common Internet File System (CIFS) and Network File System (NFS). 

  • cloud file syncing

    Cloud file syncing is an application that updates files held in different locations through the cloud.

  • cloud hosting

    Cloud hosting is the process of outsourcing an organization's computing and storage resources to a service provider that offers its infrastructure services in a utility model.

  • cloud NAS (cloud network attached storage)

    Cloud NAS (network attached storage) is remote storage that is accessed over the internet as if it is local.

  • cloud object storage

    Cloud object storage is a format for storing unstructured data in the cloud. Object storage is considered a good fit for the cloud because it is elastic, flexible and it can more easily scale into multiple petabytes to support unlimited data growth.

  • cloud SLA (cloud service-level agreement)

    A cloud SLA (cloud service-level agreement) is an agreement between a cloud service provider and a customer that ensures a minimum level of service is maintained.

  • cloud storage

    Cloud storage is a service model in which data is transmitted and stored on remote storage systems, where it is maintained, managed, backed up and made available to users over a network (typically the internet).

  • cloud storage API

    A cloud storage API is an application program interface that connects a locally-based application to a cloud-based storage system, so that a user can send data to it and access and work with data stored in it. To the application, the cloud storage system is just another target device, like tape or disk-based storage.

  • cloud storage gateway

    A cloud storage gateway is a hardware- or software-based appliance that serves as a bridge between local applications and remote cloud-based storage. The appliance is located on the customer’s premises.

  • cloud storage infrastructure

    Cloud storage infrastructure is the hardware and software framework that supports the computing requirements of a private or public cloud storage service.

  • cloud storage provider

    A cloud storage provider, also known as a managed service provider (MSP), is a company that offers organizations and individuals the ability to place and retain data in an off-site storage system.

  • cloud storage service

    A cloud storage service is a business that maintains and manages its customers' data and makes that data accessible over a network, usually the internet.

  • cloud testing

    Cloud testing is the process of using the cloud computing resources of a third-party service provider to test software applications.

  • cloud washing

    Cloud washing is the purposeful and sometimes deceptive attempt by a vendor to rebrand an old service by associating the word "cloud" with it.  

  • cloud-integrated storage (CIS)

    Cloud-integrated storage (CIS) is a term that refers to a conventional storage-area network (SAN), network-attached storage (NAS) or unified storage system that tiers and/or caches data to cloud-based storage and treats the cloud storage as if it were part of the primary storage system.

  • cloudware

    Cloudware is software that runs on a remote Web server rather than on a mobile computing device, personal computer (PC) or traditional on-premises application server.

  • clustered file system (CFS)

    Clustered file systems are file systems that run on multiple storage servers and can be accessed and managed as a single system.

  • clustered network-attached storage (clustered NAS)

    A clustered NAS system is a distributed file system that runs concurrently on multiple NAS nodes.

  • COLD (Computer Output to Laser Disk)

    COLD (Computer Output to Laser Disk) is a system for archiving data such as business records and reports to one or more optical disks in a compressed but easily retrievable format.

  • cold storage

    Cold storage is a computer system or mode of operation designed for the retention of inactive data.

  • Common Assurance Maturity Model (CAMM)

    The Common Assurance Maturity Model (CAMM) is a global project to list the information assurance maturity of suppliers offering provisioning services (for example, cloud providers).

  • compact disc (CD)

    A compact disc is a portable storage medium that can be used for recording, storing and playing back audio, video and other data in digital form.

  • CompactFlash card (CF card)

    A CompactFlash card (CF card) is a memory card format developed by SanDisk in 1994 that uses flash memory technology to store data on a very small portable device.

  • computational storage

    Computational storage is an information technology (IT) architecture in which data is processed at the storage device level to reduce the amount of data that has to move between the storage plane and the compute plane.

  • content-addressed storage (CAS)

    Content-addressed storage (CAS) is a method of providing fast access to fixed content (data that is not expected to be updated) by assigning it a permanent place on disk. CAS makes data retrieval straightforward by storing it in such a way that an object cannot be duplicated or modified once it has been stored; thus, its location is unambiguous.

  • continuous data protection

    Continuous data protection (CDP), also known as continuous backup, is a backup and recovery storage system in which all the data in an enterprise is backed up whenever any change is made.

  • converged network adapter (CNA)

    A converged network adapter (CNA) is a single network interface card (NIC) that contains both a Fibre Channel (FC) host bus adapter (HBA) and a TCP/IP Ethernet NIC.

  • copy data

    Copy data is the electronic data that is created as a result of data protection functions like backups, snapshots and disaster recovery.

  • copy data management (CDM)

    Copy data management (CDM) is an approach to reducing storage consumption that involves eliminating the unnecessary duplication of production data.

  • OpenStack Block Storage (Cinder)

    OpenStack Block Storage (Cinder) is open source software designed to create and manage a service that provides persistent data storage to cloud computing applications.

  • 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.

  • 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 computer storage manufacturers and storage service providers to describe how data should be available at a required level of performance in situations ranging from normal through disastrous.

  • 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 lifecycle management (DLM)

    Data lifecycle management (DLM) is a policy-based approach to managing the flow of an information system's data throughout its lifecycle: from creation and initial storage to 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.

  • 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.

  • Dell EMC Atmos

    Dell EMC Atmos is an object-based cloud storage platform that was released in November 2008 by EMC.

  • 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.

  • 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 a type of storage that is attached directly to a computer without going through a network.

  • 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 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.

  • diskette (floppy disk)

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

  • 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.

  • driver

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

  • 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-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.

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