It *should* be OK; but it does depend on the drive. I've accidentally connected stuff up backwards once and no harm came of it. I don't know about integrated controllers - depends on whether the controller has a BIOS to it or whether it's just dumb. Sounds like you've got a standard AT BIOS that supports IDE drives, in which case the SCSI controller's either completely dumb and you have to boot from an IDE drive, or (as with standard SCSI controllers) there's a seperate SCSI BIOS which needs some key-combination entered (such as CTRL-A on Adaptec cards) on boot up in order get into it and set up your SCSI devices. If you know who made the motherboard, you may be able to find info on the web somewhere... cheers Jules