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SATA was launched in 2002 replacing the parallel ATA (PATA) interface to provide faster speeds of 1.5Gbit/s approx 150MB p/s, longer cables and scope for increases in the future.
In 2005 SATA 2 was introduced with double the speed of the standard SATA providing 3Gbit/s approx 300MB p/s.
Seagate and AMD have recently demonstrated a 6Gbit/s link from SATA disks to a server, this is double the speed of their current SATA 2 and is also just as fast as the latest SAS speed.
The reason for the speed increase is to keep up with the ever accelerating growth of storage and cashe capacity of SATA hard drives currently at 2TB with potential to double or even treble in the future. Also more power for server processors through muli-core technology and multi-CPU, also SSD’s with SATA interface such as Intel's X25-M will benefit with more I/O to/from the drive.
Seagate recommends that the drive interface remain ahead of the current data rate to prevent throttling back the device. It is suggested that SATA 3 will not be needed until 2011 unless used for advanced data steaming.