External HD accessible, but data corrupted.

I recently switched the disk in an external HD with my internal HD. It worked fine at first, but since yesterday about 50% of the files on the drive are corrupt (for example images are all cut up, have mixed up colors or are partially black). I don't know if there is a connection with changing the disks or if that was just a coincidence. I gave chkdsk a shot but it didn't seem to help.

Any suggestions about how to repair this?
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  1. Best answer
    Can you give us more information about the external drive? Is the drive larger than 2TB, and did you recently write new data beyond the 2TB point?
  2. It's 2TB, and only about one quarter full. As far as I remember i haven't written anything to the drive recently.
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