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Parallel ATA (PATA) is an interface standard for the connection of storage devices such as hard disks, floppy drives, and optical disc drives in today's computers
ATA is AT Attachment
ATA interface itself evolved from Western Digital's original Integrated Drive Electronics (IDE) interface
ATA-3 Introduced optional security features, passwords on BIOS, see http://en.wikipedia.org/wiki/ATA-3
ATA-4 Added the Host Protected Area (HPA)
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