I am having the exact problem with my seagate portable expansion external hard drive 500GB. Only difference is, i just bought mine today and when i plugged it, it displayed. I copied files on to it but these files and folders just disappeared on their own and i tried formatting it but it won't format with any file system. Now i cant access the drive and i can't format it.
The disk-drive inside the enclosure is "dying".
If the warranty still is valid, exercise the warranty to get it replaced, at minimal cost to you.
If the warranty has expired, open the enclosure, remove the disk-drive, and take the disk-drive to a computer-store. Buy a new, compatible, drive, and then "transplant" it into the enclosure, to "revive" your external file-storage appliance.
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