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SATA (Serial ATA) is a computer bus use in storage interfacing for connecting host bus adapters to mass storage devices such as hard disk drives and/or optical drives.
Serial ATA was designed in mind to replace the older ATA (AT Attachment) standard (also known as EIDE). It is able to use the same low level commands, Yet SATA host-adapters and devices communicate via a high-speed serial cable over two pairs of conductors. The old Parallel ATA used 16 data conductors each operating at slower speeds.
Main advantages of SATA over the older parallel ATA (PATA) interface: reduced of cable-bulk and cost, faster and more efficient data transfer, full duplex as well as the ability to hot swap devices.
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