Well, I came back to play some more MGS yesterday and turned the PS3 on.....
I got a message saying, the harddrive needed rebuilding and to click ok.
Then I got told all my data was going to be wiped as it needed to be formatted due to the rebuild not doing its job.
So I had no choice. As a result I've lost ALL my game saves!
arrrrgghhh!!!! Hours of R:FOM, Assassins, MGS, Pro Evo, Lego Star wars etc etc etc GONE!
So, if you have a PS3, and HAVENT backed up your game saves, do it now.
Ive looked around the net and it seems to be a fairly popular problem, especially after update 2.0 so look out.