I had the same thing happen to my 2GB Sony. The chances are your file system is corrupted. The easiest way to get around this is to format it again. If you have data on there you can't lose, then you can use a file system repair tool (like fsck on Linux or chkdisk on Windows) to repair it.
And x999x, Sandisk memory sticks are fine.
Sonicboy 101: yes, that's usually an indication that the memory stick is genuine.
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