I have two hard drives and one if them wont work

E68 is the error code for a bad hard drive, im sorry but the hard drive may just be bad and cant be fixed. one thing to try is to clean the metal contact on the bottom of the drive with a q tip and cleaning alcohol. try it in a friends system. Ive don't know how you do this but try to find a way to clear the hard drive of all memory and format it, Ive seen this kit for transferring data from one to another but i don't think that will work on a bad hard drive