that is the most stupidest thing i`ve ever heard lolzmaster its an ultra lie and staff1 if ur slim or phat can still read ur memstik and u still want to format it:
1.put 4 gig inside
2.go to usb mode
3.open ur psp files
4.and tell ur computer to format memstik.
And im really sure this should b in the help section not modding section