I would suggest (and I'll try to be sensible) ;-)
Primary hard disk as Master on IDE 1.
CD-RW as Master on IDE 2.
If the CD-RW and DVD-ROM are relatively similar in speed, and the CD-RW has a version of BURN-Proof, then slave the DVD-ROM to the CD-RW on IDE 2.
If you do a lot of "on-the-fly" CD copying, and the CD-RW does <i>not</i> have BURN-Proof ... slave the DVD-ROM to the Primary hard disk on IDE 1.
If the data transfer rate of the DVD-ROM is much slower than the CD-RW, either slave it to the Primary hard disk, and/or always cache the CD's contents to the hard disk and then make the copy, regardless of the device placement. This will avoid buffer-underruns. BURN-Proof isn't infallible, although it removes these kinds of problems almost entirely.
If you aren't going to do a lot of CD-to-CD copying, and/or don't mind caching the CD's contents to the hard drive when making copies, keep it as a slave on IDE 2.
In other words, what it boils down to is the data transfer rate of the DVD-ROM, whether the CD-RW has some variation of BURN-Proof, and if you are going to be copying CD's on-the-fly on a regular basis.
Did that make sense? LOL!
If you are not sure of your data transfer rates for your optical devices, there is a good testing site on the Web that can give you this information. Excellent site for testing different aspects of your system.
<A HREF="http://pcpitstop.com/" target="_new">http://pcpitstop.com/</A>
You should also be able to locate the specifications for a particular device at the manufacturer's website.
Toejam31
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