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2. Hard disk drive performance characteristics - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive...

   A hard disk head on an access arm resting on a hard disk platter. The access time or response time of a rotating drive is a measure of the time it takes before the drive can actually transfer data. The factors that control this time on a rotating drive are mostly related to the mechanical nature of the rotating disks and moving heads. It is ...

3. Computer data storage - Wikipedia

   en.wikipedia.org/wiki/Computer_data_storage

   A read/write head only covers a part of the surface so that the head or medium or both must be moved relative to another in order to access data. In modern computers, magnetic storage will take these forms: Magnetic disk; Floppy disk, used for off-line storage; Hard disk drive, used for secondary storage.

4. Solid-state drive - Wikipedia

   en.wikipedia.org/wiki/Solid-state_drive

   Most of the advantages of solid-state drives over traditional hard drives are due to their ability to access data completely electronically instead of electromechanically, resulting in superior transfer speeds and mechanical ruggedness. [19] On the other hand, hard disk drives offer significantly higher capacity for their price. [6] [20]

5. Network-attached storage - Wikipedia

   en.wikipedia.org/wiki/Network-attached_storage

   The first type of NAS is focused on consumer needs with lower-cost options that typically support 1–5 hot plug hard drives. The second is focused on small-to-medium-sized businesses – these NAS solutions range from 2–24+ hard drives and are typically offered in tower or rackmount form factors.

6. Hard disk drive - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive

   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.

7. Direct-attached storage - Wikipedia

   en.wikipedia.org/wiki/Direct-attached_storage

   A typical DAS system is made of a data storage device (for example enclosures holding a number of hard disk drives) connected directly to a computer through a host bus adapter (HBA). Between those two points there is no network device (like hub, switch, or router), and this is the main characteristic of DAS.

8. Direct-access storage device - Wikipedia

   en.wikipedia.org/wiki/Direct-access_storage_device

   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] Later, optical disc drives and flash memory units are also classified as DASD.

9. Hard disk drive interface - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive_interface

   The earliest hard disk drive (HDD) interfaces were bit serial data interfaces that connected an HDD to a controller with two cables, one for control and one for data. [ a ] An additional cable was used for power, initially frequently AC but later usually connected directly to a DC power supply unit.