I'm not sure whether this article has been mentioned here before, but it definitely is worth a read:
http://www.usenix.org/events/fast03/tech/full_papers/anderson/anderson_html/ >From the proceedings of the FAST '03 conference: More than an interface - SCSI vs. ATA Dave Anderson, Jim Dykes, Erik Riedel Seagate Research Abstract: This paper sets out to clear up a misconception prominent in the storage community today, that SCSI disc drives and IDE (ATA) disc drives are the same technology internally, and differ only in their external interface and in their suggested retail price. ... This paper attempts to clarify the differences by illuminating some of these design choices and their consequences on final device characteristics. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings