Two separate IDE drives should help considerably because of
access arm movements regardless of drives (assuming nothing
else is beating up the disks at the time, in which case
nothing's going to help much).
If they are on different controllers, another increment.
If they are Ultra SCSI or capable of PIO mode <something
or other, I think 3 or higher>, and the controller
supports PCI bus mastering DMA, that should help consdiderably
even if they are on the same controller, and even more on
different controllers.
Finally, if they are on a caching IDE controller, another
big increment is possible.
Some of the later IDE solutions could probably beat earlier
SCSI ones, though at the same level of technology (i.e.,
age <G>) SCSI should be better.
Price performance, now, that's another question <G>.
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