I just had another one go bad in the exact same way. Writes slowed to a crawl, I rebooted the system and when it came back up the partition was gone and it shows as 13000 MB in disk management. I'm beginning to see a pattern here. The ones I've kept in their enclosures are fine. Does anyone have any ideas? I can reformat the drive but I only get 1.2 TB. I don't think I'm going to buy another one of these at this rate. I still have one in its box and I kind of want to return it. I don't think it's worth the $50 savings to have to deal with this hassle.