MTBF = Mean time before failure, although in the case of the xbox i would say Umpkins interpretation is infact more accurate
The Jaspers are no better, same shoddy build quality which has been masked slightly by the shrinking of the fabrication process.
Cam in Head you will be waiting around for ever if you use a usb flash drive to store your forza 3 data on. write speed of cheap/mid grade usb drives is between 1-5 MB/s compared to 60-100MB/s of a regular hard drive. If the warranty has expired there are 3rd party spares available to replace / upgrade it.