Hi Dave.
So sorry I missed your reply.
Have you got this working again yet, can you see the two files on the slug ?
Telnet in and cd /
then ls -a this should confirm the existance of the files.
rm /.unslung
then
rm /.sd?root
ls -a again they should be gone.
Attach the drive, format it and try the unsling again.
Its a long time since I used my slugs however as I only use Buffalo LSII’s now.
Pete