Not all Macs can use cable select, some have to be master/slave jumpered. And not all IDE cables are the same either. I have a feeling you will have to master/slave jumper your drives in the DA.
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Unfortunately, regular 40-conductor IDE/ATA cables don't support cable select. (Why this came about I do not know, but I suspect that some bean counter determined they could save five cents on each PC by doing this.) So to use cable select you need a special cable, and these are of course non-standard, making them a special purchase. Also, many people don't understand cable select, nor do they realize it needs a special cable. If you set both drives to "CS" and then use them on a regular (non-cable-select) IDE cable, both drives will configure themselves as "master", causing a configuration conflict.
http://www.pcguide.com/ref/hdd/if/ide/confCS-c.html
More info on cable select/master/slave settings and configuring:
http://www.pcguide.com/ref/hdd/if/ide/conf.htm
Here is some reading regarding cable select and the type of ATA cable needed:
http://forums.macosxhints.com/archive/index.php/t-28079.html
BTW, here's the URL to the DA's setup manual which may be helpful to you.
It's a bit over 3MB.
http://manuals.info.apple.com/en/PowerMacG...lAudioSetup.PDF
Here you go (from the manual):
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Your Macintosh can accommodate two internal 1-inch-high ATA devices in the U-shaped drive carrier in drive position 3 in the computer. If your computer has one Ultra ATA drive, it sits in the lower portion of this U-shaped drive carrier. You can install a second ATA device in the upper part of the carrier. The drive that came with your Macintosh is designated the “master drive” (sometimes called “drive 0”). The ATA drive you add as a second drive is called the “slave drive” or “drive 1.” 1 Configure your drive as a slave drive by setting the appropriate jumpers. Contact your drive manufacturer or consult the manufacturer’s Web site to determine the correct settings. Note: Your Macintosh doesn’t work with Ultra ATA devices set for cable select mode.