Push the little HOME button on the bottom left of the face of the unit.
Use the arrow keys to move to the SETTINGS area, then move the up and down keys until you get to System Settings.
The Sony PSP will now confirm that you want to reformat the memory stick

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 6 inch
Height : 0.2 inch
Length : 6 inch

Item Weight: 1 pounds (View shipping rates and policies)
Shipping Weight: 0.32 ounce (View shipping rates and policies)

ASIN : B002ISI3EC