Paul, Keep the IDE HD alone as master on your primary IDE, you'll benefit performance wise. Check with the CD-RW manufacturer on how it should be installed. I have a similar set-upon my computer. My CD-RW maker recommends that it be used as a slave to the CD-ROM, together, on the secondary IDE channel. HTH Rick PCBUILD maintains hundreds of useful files for download visit our download web page at: http://nospin.com/pc/files.html