I ran chkdsk /f /r and rebooted.
It gets to 19% at step 4 and stays like that for ages. Then a message pops up about "not enough disk space to replace bad sectors" before crashing to a stop error about hard failure.
I ran Powermax (Maxtor hard drive) and it tells me the drive is failing.
Problem How can I get it out of the chkdsk loop to transfer my data to my slave drive?