yes Sandra i've tried chkdsk, as i mentioned it cant complete the scan tho' i cant remember the reason given if any, thats why i would like to do a fuller scan to ascertain the problem. I suspect this will be my third maxtor drive that is about to fail, they dont seem to cope very well with heat when they run in close proximity to another drive (the caddy drive used to be the master in my old pc and was subjected to high temperatured for a year or so). As a side note I recently got some fans that fasten to the underside of (internal) drives. £7.99 at maplins. Installed one to my OS drive in old pc (mesh). I couldnt find room to fix a second fan to the slave drive as they fit in a purpose made internal caddy, however both the temps have reduced a lot, the OS drive has reduced from ~ 50deg c average to ~38 deg c and the slave without the fan has reduced from ~ 52 deg c average to ~ 45 deg c. Still quite hot but a big improvement. Shame there's no room to fit them in my medion offering tho' they currently run around 40 deg c and 44 deg c so the situation isnt as bad.
edit, i said fdisk in my first post
i meant to say chkdsk oops