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I have a Windows 7x64 Ultimate, 6 GB memory, 1 TB HD. 3TB Barracuda XT HDD. The HDD is installed on a StarTech 4 bays external enclosure I had troubles so I converted to a GPT, created 1 partition and formatted as NTFS. The hard drive I can write and read to and from the hard drive but it will become unreadable at some point while I am copying files or after I have copied files to it.

I have copied large Bluray movies and diverse video files, I have also copied 32 GB of pictures, and I have copied about 86 thousand music files in different formats. At some point the partition becomes unreadable and I have to format the partition again (all files lost) and I have to start the whole process again. At some point I have been unable to copy large ISO (Bluray movies) file images.

I have partitioned the HDD in 2 partitions P1 - 2TB, P2 - 1TB and I have lost every single file in either partition the same way. I reformat the HDD and it seems fine.

I have run seatools to check the hard drive and it reports to be OK.

What gives?

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It sounds like you can use the drive, but at some point it becomes corrupt and you have to re-partition. Can you try mounting it internally and see if that helps? Otherwise I'd just say its a bad drive and return it. –  Andrew Backer Jun 12 '12 at 5:54
    
Does your external enclosure support 3tb GPT disks? Have you tried the 3tb drive in another enclosure as a test? My money is on the encolsure causing the problems. –  Moab Jun 12 '12 at 14:14
    
It sounds like the enclosure is to blame. You have had problems so you converted to GPT. You still have problems. The only thing that remained the same is the enclosure. –  Ramhound Jun 26 '12 at 15:39

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