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There are two connectors on a SATA drive, one is for power and the other is the data connector. A PATA drive has different connectors as well, but the data drive for PATA is much larger than that of SATA. SATA cable has a 7-pin connector and a 12 inch minimum and 1 meter maximum cable length and why this configuration is necessary, and has 4 connection types, one of which allows for connectivity externally to the computer system.