Understanding ATA and SCSI

In 2003, two interface standards dominate the hard disk market: Advanced Technology Attachment (ATA), aka Enhanced Integrated Drive Electronics (EIDE), and Small Computer System Interface (SCSI). Each standard includes various "sub-standards" that deliver differing levels of performance. Disks and disk-like devices (CD-ROM drives, tape drives, and so on) attach to an ATA controller or SCSI host adapter. You can use both ATA and SCSI interfaces on one computer, if you need both.

Note Floppy drives interface to computers through a third type of connection, generally referred to as a floppy controller. This interface is very low-speed and isn't good for much except handling floppy disks, although some early tape drives used this interface.

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