Trying to run fix-disk utility in 'maint' mode, and during initial short disk self-test, reports "Error at LBA 0" followed by Block 0 OK, Block 1 OK, Block 2 OK,,etc until Block 7, then simply recycles after 60 secs with the same messages. Left running for about 10 mins before quitting. Is this recoverable at all, or has the HD had it?