I don't think you can, because the majority of bootleg memory sticks are compressed so they read a larger capacity than they actually are.
I.e:
32mb > 1GB - 64mb > 2GB - 128mb > 4GB.
On a PC, erased data can be restored until something takes the memory that it once had. I read somewhere that deleted files weren't actually deleted, but I believe it to be different for a memory stick as it's nothing more than a microchip in an enclosure.
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