>> Is there anyway to enable NCQ on CentOS 4.6? I guess anouther >> question is on a somewhat high activity mail server with a single >> SATA2 drive will it do any good? >> > > > most of the tests I've seen, the overhead of SATA NCQ exceeds any gains and > it ends up slower :-/ Isn't there something like disk i/o ladder in the linux kernel that does about the same thing anyway? But how could it tell what physical position the head is at and which is the closest next place to go? Matt