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3.5" SAS Drives

Seagate Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512n) ST2000NM0045 3.5" SAS 12Gb/s 2TB 7200rpm
TOP SELLER
Seagate ST2000NM0045
ex.VAT £112.00 £134.40
2TB 7200 RPM
Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512n)
Seagate alternative
Seagate Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512n) ST1000NM0045 3.5" SAS 12Gb/s 1TB 7200rpm
Seagate ST1000NM0045
ex.VAT £88.00 £105.60
1TB 7200 RPM
Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512n)
Seagate alternative
HGST Ultrastar 7K6000 (512e) ISE HUS726020AL5210  0F22799 3.5" SAS 12Gb/s 2TB 7200rpm
£16.80 OFF
HGST HUS726020AL5210 0F22799
ex.VAT £108.00 £129.60
2TB 7200 RPM
Ultrastar 7K6000 (512e) ISE
HGST alternative
HGST Ultrastar 7K6000 (512n) ISE HUS726020ALS210  0F22943 3.5" SAS 12Gb/s 2TB 7200rpm
£16.80 OFF
HGST HUS726020ALS210 0F22943
ex.VAT £108.00 £129.60
2TB 7200 RPM
Ultrastar 7K6000 (512n) ISE
HGST alternative
Seagate Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512e) ST2000NM0135 3.5" SAS 12Gb/s 2TB 7200rpm
Seagate ST2000NM0135
ex.VAT £127.00 £152.40
2TB 7200 RPM
Exos 7E8 (Enterprise Capacity 3.5 HDD V.5) (512e)
Seagate alternative
HGST Ultrastar 7K6000 (512e) ISE HUS726040AL5210  0F22795 3.5" SAS 12Gb/s 4TB 7200rpm
£18.00 OFF
HGST HUS726040AL5210 0F22795
ex.VAT £150.00 £180.00
4TB 7200 RPM
Ultrastar 7K6000 (512e) ISE
HGST alternative
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3.5" SAS 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.



Serial Attached SCSI (SAS) is a point-to-point serial protocol that moves data to and from computer storage devices such as hard drives and tape drives. SAS replaces the older Parallel SCSI (pronounced "scuzzy") bus technology that first appeared in the mid-1980s. SAS, like its predecessor, uses the standard SCSI command set. SAS offers backward compatibility with second-generation SATA drives. SATA 3 Gbit/s drives may be connected to SAS backplanes, but SAS drives cannot connect to SATA backplanes.



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

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