[quote name='Chris Dillon']Whats cache space. I know how to delete it but I don't know if i should.[/QUOTE]
You can't delete it. It's there forever. It's so developers can, if they chose, write their games to use the hard drive to increase load performance. Or, they actually have the option of making a game that REQUIRES a hard drive (none have yet). So if you filled your hard drive to the brim with videos and demos, and then insert a game that wants to use the hard drive, you won't run into problems because 8 gigs is always reserved.