[Editor’s note: This bug is corrected with R3.2 and later]
Many people are finding that they have problems with their R3/Intel installations if the CD-ROM is configured as a slave drive on the secondary bus. In some instances, you’ll need to make sure that if the CD-ROM is alone on a bus, it’s set as master, not slave. e.g. if your CD-ROM is the only thing on your secondary bus, make sure it’s the master.
You should find small jumper pins (tiny black slide-on thingies) on your drives, and hopefully a sticker or something on each drive describing how to set the jumpers. If you can’t find documentation for your drive, check the manufacturer’s web site.
In some cases, R3 won’t install at all if it’s on the secondary IDE channel.