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SATA has been around for several years and finally prevails in the desktop market. Most 3.5" desktop hard drives now come with SATA interfaces, and the interface is increasingly prevalent in notebooks. The bandwidth difference has proven to be interesting on paper only, as even the fastest 3.5" SATA drives do not exceed 85 MB/s. A data transfer rate of 300 MB/s between a PC and a SATA drive cannot thus be matched by the speed of a SATA drive.
Here is a list of additions to the SATA specification to support external eSATA:
Meanwhile, eSATA and SATA connectors are not interchangeable, so you cannot plug a SATA drive to an external eSATA port.