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HDD (Hard Drives)

Seagate Video 3.5 HD (Pipeline) ST3320311CS 3.5" SATA 3Gb/s 320GB 5900rpm
Seagate ST3320311CS
ex.VAT £27.00 £32.40
320GB 5900 RPM
Video 3.5 HD (Pipeline)
Seagate alternative
Seagate Momentus Thin 5400.9 (7MM) ST500LT012 2.5" SATA 3Gb/s 500GB 5400rpm
Seagate ST500LT012
ex.VAT £35.00 £42.00
500GB 5400 RPM
Momentus Thin 5400.9 (7MM)
Seagate alternative
Toshiba Desktop DT01ACA100 3.5" SATA 6Gb/s 1TB 7200rpm
Toshiba DT01ACA100
ex.VAT £38.00 £45.60
1TB 7200 RPM
Toshiba alternative
HGST Travelstar Z7K500 (7MM) HTS725050A7E630  0J26005 / 0J38075 2.5" SATA 6Gb/s 500GB 7200rpm
HGST HTS725050A7E630 0J26005 / 0J38075
ex.VAT £39.00 £46.80
500GB 7200 RPM
Travelstar Z7K500 (7MM)
HGST alternative
HGST Travelstar 5K1000 HTS541010A9E680  0J22413 2.5" SATA 6Gb/s 1TB 5400rpm
HGST HTS541010A9E680 0J22413
ex.VAT £41.00 £49.20
1TB 5400 RPM
Travelstar 5K1000
HGST alternative
Seagate BarraCuda (Desktop) ST500DM009 3.5" SATA 6Gb/s 500GB 7200rpm
Seagate ST500DM009
ex.VAT £43.00 £51.60
500GB 7200 RPM
BarraCuda (Desktop)
Seagate alternative
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HDD (Hard Drives)

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A hard disk drive (HDD)is a data storage device used for storing and retrieving digital information using rapidly rotating discs (platters) coated with magnetic material. An HDD retains its data even when powered off. Data is read in a random-access manner, meaning individual blocks of data can be stored or retrieved in any order rather than just sequentially. An HDD consists of one or more rigid ("hard") rapidly rotating discs (platters) with magnetic heads arranged on a moving actuator arm to read and write data to the surfaces.

Introduced by IBM in 1956, HDDs became the dominant secondary storage device for general purpose computers by the early 1960s. Continuously improved, HDDs have maintained this position into the modern era of servers and PCs. More than 200 companies have produced HDD units, though most current units are manufactured by Seagate, Toshiba and Western Digital. Worldwide revenues for HDDs shipments are expected to reach $38 billion in 2012, up about 19% from $32 billion in 2011.

The primary characteristics of an HDD are its capacity and performance. Capacity is specified in unit prefixes corresponding to powers of 1000: a 1-terabyte (TB) drive has a capacity of 1,000 gigabytes (GB; where 1 gigabyte = 1 billion bytes). Typically, some of an HDD's capacity is unavailable to the user due to use by the file system and the computer operating system, and possibly inbuilt redundancy for error correction and recovery. Performance is specified by the time to move the heads to a file (Average Access Time) plus the time it takes for the file to move under its head (average latency, a function of the physical rotational speed in revolutions per minute) and the speed at which the file is transmitted (data rate).

The two most common form factors for modern HDDs are 3.5-inch in desktop computers and 2.5-inch in laptops. HDDs are connected to systems by standard interface cables such as SATA (Serial ATA), USB or SAS (Serial attached SCSI) cables.

This article is licensed under the GNU Free Documentation License. It uses material from the following Wiki article(s) :
* Hard_disk_drive


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