Just got an optibay http://www.mcetech.com/optibay/index.html I had a problem with the computer not mounting the disc. But solved this by swapping the locations. ie put the old hard drive in the optibay holder into the superdrive. Put the new one in the native bay. I copied my entire system onto the new disc in the native bay, and am booting from that as its faster. Its a 320gig 7200rpm disc. The old drive in the optibay/superdrive bay is 120gig 3200rpm. Still having troubles like: occasional system freeze. Wake from sleep very slow. Sometimes 10 secs or more. Sometimes need to push power button. The MacBook Pro is 2.26ghz 4gigs ram, only 1 or 2 gigs of my files on it. Up to date software (snow leopard 10.6.1). MCE has virtually no tech support. Still waiting for a reply about why my disc didn't mount a week later (even though I already solved that). Any ideas on why the bad performance? Do you think the different speed drives is messing things up?