SATA=Serial ATAcan travel date up to 150MBps(may be advance to 300 and 600MB in the future), faster than parellel ATA(PATA)SATA has a thinnner cable and a smaller connection and cable length is about 3 ft.
RAID = Redundant Array of Inexpensive Disks or Independent Disks , is commonly used on servers in corpoate environments The most popular are raid 0 ,1 and 5 . Raid 5 is the most advanced and using disk stripping with parity and provides fautly tolerance