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What does this mean ?

The disk controller (or "hard disk controller") is the circuit which allows the CPU to communicate with a hard disk, floppy disk or other kind of disk drive.

Early disk controllers were identified by their storage methods and data encoding. They were typically implemented on a separate controller card. Modified frequency modulation (MFM) controllers were the most common type in small computers, used for both floppy disk and hard disk drives. Run length limited (RLL) controllers used data compression to increase storage capacity by about 50%. Priam created a proprietary storage algorithm that could double the disk storage. Shugart Associates Systems Interface, (SASI) was a predecessor to SCSI.

Main article: Hard drive

Modern disk controllers are integrated into the disk drive. For example, disks called "SCSI disks" have built-in SCSI controllers. In the past, before most SCSI controller functionality was implemented in a single chip, separate SCSI controllers interfaced disks to the SCSI bus.

The most common types of interfaces provided nowadays by a disk controllers are ATA (IDE) and Serial ATA for home use. High-end disks use SCSI, Fibre Channel or Serial Attached SCSI.

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Controller Cards

Compare controller cards prices from a wide range of UK shops on Mister-Price UK. Browse through the controller cards offers below, showing the best controller cards from Adaptec, HP, Belkin and more.

Dell for home SAS HDD CBL

The SAS Cable is a serial link that creates a point-to-point connection between devices. This...

Dell Home
£27.03

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Controller Cards

Dell for home SAS HDD CBL

Dell for home Ultra4 Upgrade PV22xS Single ZEMM...

Dell for business Perc4E-DI Embedded Raid...

Dell for home Scheda Controller PERC 5/i interno...

Belkin for business Belkin Hi-Speed USB 2.0 3-Port...

Dell for home SATA HDD CBL

Belkin for business Belkin Internal IDE Dual Hard...

Dell for home Type 4, PS5000 Controller

Dell for home SCSI 39320A Controller Card for...

Dell for home PERC 5/i Serial Attached SCSI RAID...

Dell for home PERC4 SC RAID controller, 64Mb,...

Dell for business PERC 5/i internal RAID...

Adaptec for business SCSI Card 29320A-R - Storage...

Origin Storage for business SCSI U320 Host Bus...

Dell for business PERC 5/i internal RAID...

Adaptec AVA-2904

Adaptec SCSI Card 29160

Adaptec SCSI Card 2930 Ultra

Adaptec ATA RAID 1200A

Adaptec AHA-2940AU

Nisis PCMCIA USB 2.0 Card