insufficient space playstation 2

How do you delete all these other files if you can from your memory card? When i go to save the game it says i have insufficient space.

Start up the Playstation 2 without a disc in.

Might go without saying but if you are clearing space, be sure you no longer want what you're deleting. Few things are as frustrating as realising you've just deleted that saved game with 100% completion and everything unlocked.