I've created a new thread for you so your question doesn't get lost.
The link you've provided is to the Passport drive, which is an external USB drive. In other threads, I and others have discussed taking the drive out of this case and using it in their MBs and MBPs (it is compatible). If you don't know what you're doing, buy a bare 2.5" SATA drive from a place like Newegg (
http://www.newegg.com). Any 2.5" SATA drive is compatible. Replacing the drive is described in your user manual since it is a user-replaceable part on the MBs.
Steve