Thanks for all the replies, sorry I have not got back sooner.
Stingly: It is a USB hard disk, which contains all my media, and it is connected direct to the computer. I can browse it from the KDE desktop, but cant see any of the media on it from LinuxMCE.
Hagen: I think i chose 'make all content public' although i chose another drive also and picked 'Use the LMCE folder structure' and neither seem to give me access to any of my media through MCE
Zaerc: Thanks, I had a little look in Files & Media > Media Files Sync in the web admin, and couldnot see any media, I will have another play around in the Web Admin, and see if I can gt it to work.
Thanks again guys, I will post any updates, and let you know how I get on.