Hello All, I have a MacBook Pro 13' with 2.26Ghz (I think it's late 2009 model). After seeing the speed & responsiveness of my GF's new MacBook Air, i just HAD to have something like that on my machine, so I went and bought an SSD. While reading info on the SSD, I found about the MCE Optibay Mod, which (as most you know), takes out the Superdrive & replaces it with another HD. This was the perfect solution for me! I have an external HD that i hate lugging around, but it i needed it, it had my iTunes, my movies, everything. So I went and bought the MCE Optibay enclosure. I was gonna buy a OCZ SSD 120GB, but because I was concerned about price (and the fact that I wanted the SSD to run the main OS and programs, all the data I wanted to store would be on the Optibay Drive), I went and bought the 90GB version. I also bought an WD Scorpio Blue 750GB 5400rpm to store all my data. This was the drive that was gonna go into the Optibay. They arrived so I started the procedure. Installation was flawless. I boot up the computer, and it ran perfectly, the programs opened amazingly fast, the boot up and shut down times were almost immediate. Then after the range up Mac updates, the computer started to freeze and lock up. Beachballs, slowness, etc. I started looking for info on the subject, and I found out something about Hibernation. So I went ahead and did the sudo command in Terminal to eliminate Hibernation (not a feature that I use a lot). So after a reboot, everything went back to normal, for a couple of seconds. Then the lockups, freezes, beach balls started appearing again. I was frustrated at this point. So I decide to take out the Optibay drive, and leave just the SSD running to see what's up with the main drive (after all this, I thought that it was the SSD causing the problems). The computer has been running without any hiccups, lag, slowness, beachballs, ANYTHING... Rock solid and faster than my GF's Air. As soon as i open the lid BAM, screen comes to life, programs open in an instant. That was what I was looking for on the SSD. So I decide to give it another chance. I open the Mac, install the Optibay Drive with the 750GB 5400 RPM drive in it... Not even 3 minutes and boom, lockup, lag, slowness, beach balls. I take out the Optibay drive again, SSD only mode... it runs flawlessly. Could it be something with the WD drive that I bought? A friend of mine suggested that the HD could be asking for too much power (I dont think that a superdrive needs a lot of power to run) and that's why it's causing the malfunctions? I havent tried the Optibay Mod with another drive, so maybe it could be my WD. Any thoughts or experiences regarding this?