i'm thinking of upgrading my MBPro HD. the advantage of buying the "Western Digital Passport Portable WDXMS3200TN 320GB" is to keep the enclosure to put the old internal HD inside. anone did it with the 320gb model? is it the same drive as the bare one (Western Digital Scorpio WD3200BEVT 320GB 5400 RPM 8MB Cache SATA 3.0Gb/s Notebook Hard Drive)?