Hi, Fat32 has twice the cluster bookkeeping (on the drive) capacity of Fat16 so the clusters can be smaller on the drive. Sata is serial data transfer, that is, one bit at a time. IDE is Parallell, that is, 8 bits (=1 byte) at the time. PATA - Ata is same as IDE. P is a slightly different scheme. Don't have details at present. Serial data rate is given as BITS PER SECOND. Parallet is given as BYTES PER SECOND. Hope this helps a little, Jim