I am trying to recover files from a harddrive which is probably slightly damaged. It's a 3.5' SATA harddrive, connected via USB adapter to a macbook. When plugged in it shows up in the finder as usual. When I then start to copy files from the hd it works as expected. After some time (a little bit more than 3 GB) it suddenly stops and OSX complains that the hd had been removed. When I then disconnect the hd from the macbook and power and plug it in again, the hd shows up in the finder again and "works" for some time..
I also tried to make a raw copy of the disk using
dd with a block size of 10m this completely failed, it started but then stopped with a "Device not configured" error and an empty output file.
I wonder if anybody had experienced similar problems and what might cause the hd to fail.