Maybe this could give you some ideas
my memory stick doesn't work [Archive] - DCEmu Forums:: The Homebrew & Gaming Network :: PSP Dreamcast Nintendo DS Wii GP2X Xbox 360 GBA Gamecube PS2 Forums

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This happened to me once (somehow but differently than yours) and all i did was just hooked my PSP to my computer and ran scandisk on it. Lucky for me it recovery everything. Using a Windows OS computer, to run scandisk just right click on your psp memory stick when it comes on your computer and click properties. Then goto the tools tab and run scandisk. I hope this helps you.

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when using scandisk you want to select auto fix file folder errors and check for bad sectors just to give it that extra clean

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damn! i did the scandisc and it seemed as if it worked. it no longer said 0KB , it said 955mb but it wont FORMAT...... then it went back to 0KB... im mad

edit: i got it workin HOWEVER..... it says it only has 30MB in it when its supposed to have 955MB.... any solution for THIS?

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