It's probably a fake one. I had the same problem; I bought a 16GB one for few bucks from an online store, but it was fake so I faced the same problem.
Read this guide to determine if your memory stick is fake or not: http://reviews.ebay.co.uk/FAKE-Sony-Memory-Stick-Pro-Duo-MagicGate-Cards-Exposed_W0QQugidZ10000000001535763
If it's not fake, then there might be a problem with your memory stick. Try replacing it with a new one if possible.
Hope this helped.
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