Cdrom & burner on separate cables or together?

[belveder]

Out of curiosity, I just bought a new hard drive that is 80 gig, 7200 rpm, ATA 100 with 8mg cache but my old hard drive is 30 gig, ATA 66 and runs at 5400 rpm. I would like to run both (preferably with the OS on the older, smaller one) but I read somewhere once that you can't. I read somewhere else though that the new drive should be on one IDE cable with the cdrom as slave and the old on another IDE cable with a burner as slave. But if the old drive is lower ATA and RPM that the new one won't the new drive slow down to the capabilites of the old? Also, wouldn't that affect burning separating the cdrom from the burner?


My system is only a Celeron 850 with 640 mg ram on an AOpen mobo

Can someone please tell me if you can or can't mix the drives? And if so, will having the cdrom & burner on separate cables affect burning?

Thanks in advance