Summary Of Hard Disk Drive Connectors

Hard Disk Drive Chain Of Command

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Welcome To The Hard Disk Drive Reference Section
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How Internal Drives Connect

In all personal computer storage systems there must be a way data can flow internally to other parts of the computer.

This is accomplished through an interface. A storage interface may consist of multiple pins interconnected within a square block on the back of a hard drive. On all EIDE hard drives this connector consists of 40 pins. On all SATA drives this connector is 7 pins in length.

The image to the right shows an Ultra ATA connecter composed of 40 gold plated pins.

The following table summarizes the most common interfaces found on hard disk drives.

Standard Uses Maximum Data Transmission Rate
(in mbps)
Will It Last?
ATA / IDE
  • Hard disk drives;
  • Optical storage including CD-ROM, DVD-ROM, and DVD-RAM drives.

3.3 to 133.

Remains predominately used in end-user workstations, but may be phased out by SATA technologies.

SCSI
  • Hard disk drives;
  • Tape and zip drives;
  • Removable hard drives
  • Scanners.
  • Server systems.

5 to 80.

Standard hard disk bus type suitable for high end server computers and workstations with specific performance needs including video editing and scientific computing.

USB
  • External hard disk drives;
  • Input devices including mice, keyboards, trackballs,
  • Scanners, digital cameras, webcams.

USB 1.1 = 12

USB 2.0 = 480.

Yes. At some point the USB 2.0 standard will replace serial and parellel ports completely.

IEEE 1394
  • High-speed storage drives including hard disk drives and digital cameras.

400

Expected to emerge in 2000

Standard Hard Disk Drive Interfaces, Their Typical Uses, And Maximum Data Transmission Rates
 
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