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2.5" SAS Drives

Seagate Enterprise Performance 10K.8 (512n) ST300MM0048 2.5" SAS 12Gb/s 300GB 10000rpm
Seagate ST300MM0048
ex.VAT £99.00 £118.80
300GB 10000 RPM
Enterprise Performance 10K.8 (512n)
Seagate alternative
Seagate Exos 15E900 (Enterprise Performance 15K HDD v6) (4Kn/512e) ST600MP0136 2.5" SAS 12Gb/s 600GB 15000rpm
£13.20 OFF
Seagate ST600MP0136
ex.VAT £187.00 £224.40
600GB 15000 RPM
Exos 15E900 (Enterprise Performance 15K HDD v6) (4Kn/512e)
Seagate alternative
Seagate Exos 7E2000 (Enterprise Capacity 2.5 HDD) (512e) ST2000NX0273 2.5" SAS 12Gb/s 2TB 7200rpm
£2.40 OFF
Seagate ST2000NX0273
ex.VAT £232.00 £278.40
2TB 7200 RPM
Exos 7E2000 (Enterprise Capacity 2.5 HDD) (512e)
Seagate alternative
Seagate Exos 10E2400 (Enterprise Performance 10K.9) (512e/4Kn) ST2400MM0129 2.5" SAS 12Gb/s 2.4TB 10000rpm
£4.80 OFF
Seagate ST2400MM0129
ex.VAT £340.00 £408.00
2.4TB 10000 RPM
Exos 10E2400 (Enterprise Performance 10K.9) (512e/4Kn)
Seagate alternative
Seagate Exos 10E2400 (Enterprise Performance 10K.9) (512e/4Kn) ST1200MM0129 2.5" SAS 12Gb/s 1.2TB 10000rpm
Seagate ST1200MM0129
ex.VAT £204.00 £244.80
1.2TB 10000 RPM
Exos 10E2400 (Enterprise Performance 10K.9) (512e/4Kn)
Seagate alternative
Toshiba Enterprise (512n) AL15SEB030N 2.5" SAS 12Gb/s 300GB 10500rpm
Toshiba AL15SEB030N
ex.VAT £83.00 £99.60
300GB 10500 RPM
Enterprise (512n)
Toshiba alternative
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2.5" 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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