And if that doesn't work, do what theaceoffire said, but run a chkdsk on the PSP. To do this -

• Click on Start, then Run.
• Type in "cmd" (minus quotes) into this box.
• In the box that comes up, type "chkdsk X:/" (minus quotes), but replace X with your PSP's drive letter.
• If it finds any errors, that might be the problem.

Thanks to pj1115 for the suggestion (I know he's long gone now though )

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