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HDD (Hard Drives)

Seagate BarraCuda (Laptop) ST500LM030 2.5" SATA 6Gb/s 500GB 5400rpm
Seagate ST500LM030
ex.VAT £34.00 £40.80
500GB 5400 RPM
BarraCuda (Laptop)
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WD Desktop Blue WD10EZRZ 3.5" SATA 6Gb/s 1TB 5400rpm
TOP RATED
WD WD10EZRZ
ex.VAT £35.00 £42.00
1TB 5400 RPM
Desktop Blue
WD alternative
Seagate BarraCuda (Desktop) ST1000DM010 3.5" SATA 6Gb/s 1TB 7200rpm
TOP RATED
Seagate ST1000DM010
ex.VAT £36.00 £43.20
1TB 7200 RPM
BarraCuda (Desktop)
Seagate alternative
Seagate BarraCuda (Laptop) ST1000LM048 2.5" SATA 6Gb/s 1TB 5400rpm
Seagate ST1000LM048
ex.VAT £36.00 £43.20
1TB 5400 RPM
BarraCuda (Laptop)
Seagate alternative
Toshiba Desktop DT01ACA050 3.5" SATA 6Gb/s 500GB 7200rpm
TOP RATED
Toshiba DT01ACA050
ex.VAT £36.00 £43.20
500GB 7200 RPM
Desktop
Toshiba alternative
Seagate BarraCuda (Desktop) ST500DM009 3.5" SATA 6Gb/s 500GB 7200rpm
Seagate ST500DM009
ex.VAT £38.00 £45.60
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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