Yeah but it was an accident.
Well i managed to fit in Crisis Core... all of the games other than the PSX Eboots are compressed.
EDIT

K... now i am a little scared.I remember deleting a old 0kb iso that came with it... nad then i just manually counted how much(By manually windows calculator) and it showed 7,8GB.
While my computer says the maximum sixe of the MS is 7,4GB.
I think re-copying all the isos i have back into the MS would be good to see if nothing got corrupted...