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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.

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465 results | Page 1 of 31 | next page
StarTech.com 3 Port LP PCI Express 12V PoweredUSB...

StarTech.com 3 Port LP PCI Express 12V PoweredUSB...

This PCI Express based Powered USB Adapter Card adds three Powered USB (USB PlusPower) ports to any computer, through an available PCI Express Slot, and features ...

 Dell Business e&A
£99.44
+ more choice
Startech 1 Port Esata 1 Port Sata Pcie Sata Contro

Startech 1 Port Esata 1 Port Sata Pcie Sata Contro

Startech 1 Port Esata 1 Port Sata Pcie Sata Controller Card

 Misco
£25.53
+ more choice
StarTech.com 2 Port ExpressCard IEEE-1394 Firewire Card

StarTech.com 2 Port ExpressCard IEEE-1394 Firewire Card

StarTech 2 Port ExpressCard IEEE-1394 Firewire Card

 Amazon UK
£37.64
+ more choice
2 Port Firewire Pcmcia Cardbus Card Ieee 1394 Laptop Uk

2 Port Firewire Pcmcia Cardbus Card Ieee 1394 Laptop Uk

eBay.co.uk
£13.95
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Nisis 3 port PCI Firewire Card

Nisis 3 port PCI Firewire Card

Nisis 3 port PCI Firewire Card

 Amazon Marketplace
£6.77
+ more choice
Apple Dual-Channel Gigabit Ethernet PCI Express Card

Apple Dual-Channel Gigabit Ethernet PCI Express Card

This x4 PCI Express-based dual-channel gigabit Ethernet card provides two additional Ethernet ports while providing server-class features and performance, including jumbo frames up to 9K, 802.1q VLAN tagging, and 802.3ad trunking.

 Apple Store
£163.00
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Novatech USB2 2 Port PCMCIA Controller Cardbus Adapter

Novatech USB2 2 Port PCMCIA Controller Cardbus Adapter

Novatech USB2 2 Port PCMCIA Controller Cardbus Adapter

 Novatech Direct Ltd.
£14.99
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StarTech.com 2 Port Low Profile 12V 24V PoweredUSB...

StarTech.com 2 Port Low Profile 12V 24V PoweredUSB...

Offering true Powered USB (USB PlusPower) versatility, this 2 port 12V/24V Low Profile Powered USB Adapter Card provides an expansion of the number of Powered USB ...

 Dell Business e&A
£56.56
+ more choice
StarTech.com 3 Port Low Profile PCI 12V PoweredUSB...

StarTech.com 3 Port Low Profile PCI 12V PoweredUSB...

This PCI based Powered USB Adapter Card adds three Powered USB (USB PlusPower) ports to any computer, through an available PCI Slot, and features a low profile ...

 Dell Business e&A
£60.21
+ more choice
StarTech.com 2 Port eSATA 4 Port SATA PCI Express...

StarTech.com 2 Port eSATA 4 Port SATA PCI Express...

This PCIe eSATA/SATA Controller card adds two external Serial ATA (eSATA) ports and four internal SATA ports, allowing users to harness the speed and reliability ...

 Dell Business e&A
£71.51
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StarTech.com 2 Port 12V 24V PoweredUSB Adapter Card...

StarTech.com 2 Port 12V 24V PoweredUSB Adapter Card...

Offering true Powered USB (USB PlusPower) versatility, this 2 port 12V/24V Powered USB Adapter Card provides an expansion of the number of Powered USB ports provided ...

 Dell Business e&A
£56.56
+ more choice
StarTech.com 1 Port ExpressCard Parallel Adapter...

StarTech.com 1 Port ExpressCard Parallel Adapter...

This ExpressCard Parallel Adapter turns an ExpressCard slot into a Parallel port, allowing you to connect parallel devices to a computer. The card is PCI Express ...

 Dell Business e&A
£46.61
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StarTech.com 1.8in IDE to Single Compact Flash SSD...

StarTech.com 1.8in IDE to Single Compact Flash SSD...

This 1.8in IDE to Compact Flash SSD Adapter Card allows you to convert a Compact Flash (CF type I/II) card or MicroDrive into a bootable IDE Solid State Drive - ...

 Dell Business e&A
£16.60
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Dell PCI/PCI Riser, 3 PCI only Kit

Dell PCI/PCI Riser, 3 PCI only Kit

The Low profile form factor Riser from Dell System inserts into the PCI slot . This product has been tested and validated for on Dell systems to ensure it will ...

 Dell Business e&A
£19.96
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StarTech.com 1 Port ExpressCard Parallel Adapter...

StarTech.com 1 Port ExpressCard Parallel Adapter...

This ExpressCard (34mm) based Parallel Adapter Card provides a quick and easy way to connect EPP/ECP Parallel devices to a computer using an available ExpressCard ...

 Dell Business e&A
£24.63
+ more choice
465 results | Page 1 of 31 | next page