THAT'S NOT A 2.5" DRIVE!!! It's a 1.8". Don't take the thing apart for no good reason! Here's the enclosure you need. Microcenter IS NOT going to carry one of these (I don't think).

I just got a few of these in and they work great... I had an iPod drive I'd swapped out with a larger model and put the old drive in here. No issues and I can read it just fine.

http://www.cubeternet.com/servlet/StoreFront

The P7230 has a 50 pin ATA interface so this is the housing you want. Honestly they're all so cheap I ordered one of each to have 'em on hand just in case.

[EDIT: Duh... no doubt the OP knows this by now considering the original post was in October.]