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  • Have you attempted to scan the disk for errors and possibly bad sectors? What operating system are you attempting to copy from? Commented May 23, 2012 at 19:07
  • Another option would be to remove the external harddrive and place in a PC so see whether you can copy back and forth. If the drive is S.M.A.R.T enabled, you could run the relevant tools against it to see whether it has any major issues. Commented May 23, 2012 at 19:11
  • A good tool to use would be crystalmark.info/software/CrystalDiskInfo/index-e.html. You won't even have to remove the external harddrive. Commented May 23, 2012 at 19:14
  • While I agree that the most likely source of the problem is a hardware failure, given the dearth of info I would like to cover my bases first: how many partitions do you have on the disk? Are there disk quotas? As for its age, it is unfortunately irrelevant: a disk life-cycle is determined by the number of write operations, not by its age. Commented Oct 22, 2013 at 6:45