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2. Direct-access storage device - Wikipedia

   en.wikipedia.org/wiki/Direct-access_storage_device

   A direct-access storage device (DASD) (pronounced / ˈ d æ z d iː /) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives . [1]

3. Computer data storage - Wikipedia

   en.wikipedia.org/wiki/Computer_data_storage

   When used within a robotic tape library, it is classified as tertiary storage instead. Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. [1] : 15–16.

4. Network-attached storage - Wikipedia

   en.wikipedia.org/wiki/Network-attached_storage

   Network-attached storage ( NAS) is a file-level (as opposed to block-level storage) computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. The term "NAS" can refer to both the technology and systems involved, or a specialized device built for such functionality (as unlike ...

5. Solid-state drive - Wikipedia

   en.wikipedia.org/wiki/Solid-state_drive

   An Intel mSATA SSD Samsung M.2 NVMe SSD. A solid-state drive (SSD) is a solid-state storage device. It provides persistent data storage using no moving parts. It is sometimes called semiconductor storage device or solid-state device; it is also called solid-state disk because it is frequently interfaced to a host system as a hard disk drive.

6. Direct-attached storage - Wikipedia

   en.wikipedia.org/wiki/Direct-attached_storage

   Direct-attached storage. Direct-attached storage ( DAS) is digital storage directly attached to the computer accessing it, as opposed to storage accessed over a computer network (i.e. network-attached storage ). DAS consists of one or more storage units such as hard drives, solid-state drives, optical disc drives within an external enclosure.

7. Hard disk drive - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive

   v. t. e. A hard disk drive ( HDD ), hard disk, hard drive, or fixed disk, [a] is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.