On 27-01-14 11:37, Rushton Martin wrote: > I can't test further, the disk has been broken up for destruction, but I > wonder if the problem is the disk or the USB/SATA conversion board? If the USB disk also has an eSATA port, use that one and test again. If it doesn't have an eSATA port then I always open the enclosure, take out the disk, hook it up to a SATA port on a PC and test again. If a USB disk has strange issues then these steps have always helped me figuring out if the disk was failing. HTH, Patrick