Recently I purchased a 4gb ms pro duo off of ebay. Sadly my pops games show up as corrupted icons on the ms, and my isos can execute, but shortly powers off. Is it possible that it's a fake 4gb ms pro duo? Thanks.

If this only started happening after you started to use that memory stick then it's possible but that doesn't normally happen.

i bought a 4gb high speed memory stick off of ebay and it ended up being fake, most of my files were corrupted but some games worked, any way, to check if it is fake, go to where your memory stick is and press the triangle button to get the info of the memory stick, if it says supported next to magic gate, then it is real, if not, then it is fake.