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GreyDR: Although you'll get a higher performance when both drives are in use at the same time, that will hamper the speed of the hard drives though when the CDs are in use. since IDE can only service one comand at a time, the system has to wait for the CD or DVD to finish its tasks before completing.
Sinec CD/DVDs are an order of magnitude slower than a hard drive, it can be quite a slowdown.
Especially if the CD or DVD is an ATAPI device, this makes it even slower, since ATAPI is a different protocol than hard drives use, thirdly if the CD/DVD does not support bus mastering and the hard drives do, it may cause problems.
And finally, but less common these days if the motherboard doesn't support independant timing per channel the slowest device in the chain becomes the fastest both will work at, however most modern systems do support independant channel timing.
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