Hi, sorry , i have no where to ask so i thought i might as well aksed you people here for some opinions. im in need of large capacity HDD for my uMBP. and i want the 640GB WD cause i heard good review for it, however the WD distributor in my country haven't stock it yet, and they say it might be a little bit as late as early january cause i need it urgetnly, here the question, the WD distributor in my country do have stock for 640GB but its the external one, the My Passport Essential http://www.wdc.com/en/products/Products.asp?DriveID=701 and what i need or wanted is the internal scorpio blue one http://www.wdc.com/en/products/products.asp?driveid=683 i have bad experiences in online shopping cause in my country the custom is terrible, and they took very long time to scan for shipment, so i thought is it okay if i buy the wd external one then i pry open the casing and put the harddisk inside my umbp ? are they basically the same drive ? and is the casing ( after opened) can be used with my older hard disk to be used as external one ? sorry for my broken english, but i need the answer as son as possible, thank you very much.