SATA : Computer Hardware Buyers’ Glossary

by Roedy Green ©1997-2008 Canadian Mind Products
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SATA: Serial AT Attachment, pronounced say’-tah. This is the faster successor to the older ATA IDE drives, now called PATA Parallel AT Attachment. SATA-1 transfers 150 megabytes per second. SATA 3GBits/Sec (aka SATA II) transfers 300 megabytes per second. SATA drops the shared bus of PATA, giving each device a dedicated cable and dedicated bandwidth. SATA cables are narrow with only 7 conductors. Oddly the delicate SATA power connectors have a whopping 15 pins, to deliver 3.3V, 5V and 12V.
ATA
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WikiPedia on SATA

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