I've been using this external hard drive for almost a year. Recently it started acting weird--when it was plugged in it would suddenly disappear from My Computer, it took a very, very long time to browse it, then I started getting messages saying there was a problem with the drive "click here to scan & fix" I always clicked but kept getting the message. I went on line & started hunting for a solution. I downloaded WD's lifeguard diagnostic tool & ran it. The diagnostic took forever but suggested no fix (maybe it fixed it & I wasn't aware). I got no error messages for a while but the above mentioned "weird" stuff was still happening. It's a 1TB and less than half is used but I went in & erased some back up files for computers I no longer own, defragged the drive--it started running a touch faster but no other changes. Yesterday I desperately needed information on it & Everything went to HUHUM. My computer kept hanging up. I went to re-start it and it started updating...and kept updating all night. This morning I realized that the WD My Passport has been reassigned a new drive name from H: it is now F:. Nothing is working, explorer hangs up when the hard drive is connected. Please help! I've plugged the Hard Drive into a Windows 8 or 8.1 and Vista computer--results identical.