Well I usually with hard drives ... it's double or quits! For this one is not good at all. I could format the (special care in setting win7 to benefit the entire space) and after 15 minutes it remains blocked for a copy. I disconnect and recovery copy ... ditto! Then after 15 minutes the disk disappears and never reappeared either internally or externally and connect whatever PC! Back to manufacturer ... so I expect the second! To be continued ...