at the moment I have my two hard disks as primary master and primary slave, and my two optical drives as secondary master and secondary slave. would it lead to faster performance to buy a longer ide cable and mix up the primary channel with a hard disk and optical drive and same for secondary channel? also would it be perfectly compatible to use new round ata133 ide cables between for example my ata100 hard disk and dvd rom drive or will that mean i can only transfer data as fast as my slowest drive? would the drive letters change, affecting installed programs? cheerz!