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Hooper,
Again.. a few years ago you would have been 100% correct..
Now it's a lot more convoluted. The advent of UDMA (and SATA of course) kind of makes what you say a moot point.
You're not relying on system CPU much any more for access like you were before. You have direct access to the drives.
If you go even further and put an "abstraction" layer of a hardware IDE RAID card (such as 3ware), it even gets more convoluted.. You won't tell the difference.
In fact, the adaptec RAID we have in the DB server seems to eat more CPU than IDE disks do directly connected to a controller. Of course, the RAID array gets hit slightly harder ;)
I will stand by the argument that in most (not all) applications you would not be able to see much of a difference at all between IDE and SCSI. Definitely not the 60-70% performance drop you alluded to earlier.
However, this is like arguing over abortion/OS/apple or PC/etc. So to each his own.
-Phil
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