A little later .....
I think I have the answer, courtesy of BJKeates in his advice to Richard Spandit re corrupted SATA drive info. - Knoppix, or in general, Linux (to the rescue again!)
I booted with a cd of Knoppix 3.6. This 'sees' ALL my drives including the SATA and shows it as having 17+ gigs on it. KDE offers one of the Linux CD/DVD burning progs and, presumably, it's just a matter of burning the required files onto a CD-R and transferring them to one of the other drives.
I'm nothing like up to speed with Linux so would appreciate any tips on 'how-to's or pitfalls.
My less charitable side sees it as quite ironic that Linux is the remedial method for the post-crash debris of Redmond's finest!!