I NEVER got a compact flash adaptor and a CD drive to work on the internal A4000 IDE. Its the compact flash devices fault, they usually don't support master-slave configs EVEN though they have master/slave pins on them. On the A4000 anyway, don't know about PC.
AsimCDFS is a GREAT piece of software, the only one that has worked with EVERY cd drive and interface I've thrown at it over the years EXCEP on a compact flash device. But neither did IDE-Fix, or FastaATA software. NOTHING i tried could stop the A4000 from hanging with a compact flash and cd rom on the same cable.
Use the novice option in the installer, and use a hard drive. Sorry.