I have a spare HDD that will not work as a primary slave, no matter what jumper settings, etc. It will work on the secondary IDE. But I have a CD & a CD/R/RW drives that normally occupy the secondary side of the IDE. If I put the CD (infra 52x creative) as the primary slave will it have any effect on the operation of the HDD (40gig samsung 7200rpm) under normal use or just if both units are reading/writing at the same time ?