Dinwiddie wrote:It may be a problem with the circuit in the HDD's box.
Have you tried removing the HDD from the box and installing it directly into your machine ?
If this is an purchased external drive (i.e. not a drive you put in an external casing) then this will void your warranty, and it isn't possible to do in all cases as some externals have custom connectors to prevent this from happening.
If you're getting those errors, then the drive is dead. RMA it and get a new one if it's under warranty. If you had any data on it, it's probably gone now (unless you want to pay through the nose for a data recovery service)