What brand of computer are you using? Had an issue with a Gateway2000 that had to have the secondary controller disabled in the BIOS (yah, sounds stupid) before the machine would even boot! Had a CD-ROM as Secondary slave, added a burner as Secondary master. Tech support said to do it even tho it didn't make sense- and it worked! Win98 picked the two up as D: and E:. Never ran across this with any other type of machines- the Secondary just disappeared along with the drives.