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Seagate IronWolf (NAS) ST12000VN0007 3.5" SATA 6Gb/s 12TB 7200rpm
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Seagate ST12000VN0007
ex.VAT £319.00 £382.80
12TB 7200 RPM
IronWolf (NAS)
Seagate alternative
Seagate Exos X12 (Enterprise Capacity 3.5 HDD V.7) (512e) ST12000NM0007 3.5" SATA 6Gb/s 12TB 7200rpm
Seagate ST12000NM0007
ex.VAT £344.00 £412.80
12TB 7200 RPM
Exos X12 (Enterprise Capacity 3.5 HDD V.7) (512e)
Seagate alternative
WD HGST Ultrastar DC HC520 He12 (512e) ISE HUH721212ALE600  0F30144 3.5" SATA 6Gb/s 12TB 7200rpm
£72.00 OFF
WD HUH721212ALE600 0F30144
ex.VAT £353.00 £423.60
12TB 7200 RPM
HGST Ultrastar DC HC520 He12 (512e) ISE
WD alternative
Seagate Exos X14 ST12000NM0008 3.5" SATA 6Gb/s 12TB 7200rpm
Seagate ST12000NM0008
ex.VAT £361.00 £433.20
12TB 7200 RPM
Exos X14
Seagate alternative
Toshiba Enterprise (512e) MG07ACA12TE 3.5" SATA 6Gb/s 12TB 7200rpm
Toshiba MG07ACA12TE
ex.VAT £319.00 £382.80
12TB 7200 RPM
Enterprise (512e)
Toshiba alternative
Seagate IronWolf (NAS) ST12000VN0008 3.5" SATA 6Gb/s 12TB 7200rpm
£9.60 OFF
Seagate ST12000VN0008
ex.VAT £334.00 £400.80
12TB 7200 RPM
IronWolf (NAS)
Seagate alternative
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SATA Drives 12TB

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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 ATA (SATA)is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives and optical drives. Serial ATA replaces the older AT Attachment standard (ATA; later referred to as Parallel ATA or PATA), offering several advantages over the older interface: reduced cable size and cost (seven conductors instead of 40), native hot swapping, faster data transfer through higher signalling rates, and more efficient transfer through an (optional) I/O queuing protocol.

SATA host adapters and devices communicate via a high-speed serial cable over two pairs of conductors. In contrast, parallel ATA (the redesignation for the legacy ATA specifications) used a 16-bit wide data bus with many additional support and control signals, all operating at much lower frequency. To ensure backward compatibility with legacy ATA software and applications, SATA uses the same basic ATA and ATAPI command-set as legacy ATA devices.

SATA has replaced parallel ATA in consumer desktop and laptop computers, and has largely replaced PATA in new embedded applications. SATA's market share in the desktop PC market was 99% in 2008. PATA remains widely used in industrial and embedded applications that use CompactFlash storage, even though the new CFast standard is based on SATA.



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

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