doctorq thanks very much.
So SFSCheck doesn't work with SFS/2. I should have read the .docs more closely. This has been annoying me for ages, I have reinstalled the HD umpteen times to try and get rid of the checksum error. Its all working ok as I type, I'm copying a bunch of cover CD's to the drive to test it and there haven't been any issues so far.
Weed