Thanks to you all for your replies, I will try what you say and if
all else fails I'll just wipe down and start again, this problem
appeared out of the blue, and won't seem to clear this time, and as
I said, putting two seperate drives, with two different operating
systems on them, both of them set up to recieve cookies, and neither
of them will work on the 'Cat. It just seems very strange.

Thanks once again for all your help.

May you all have a lovely Christmas and a great new year.

Cattail !