USB Hard drives are really a blessing for a regular user but it really is a disaster waiting to happen. The primary factor in degradation of any hard drive is excessive heat causing malfunction in mechanical movement or the controllers dying, and USB drives like the ones connected to the desktop have the worst track record. If I really wanted reliable storage - one USB drive wouldn't be an ideal solution for me - maybe two, or backup on a separate medium - or install the cooling fan on the drive myself DIY style.

