A mate of mine was sold an undersized stick a couple of years ago by a seller he'd used many time before (who refunded him no quibble). I think that even good ebay sellers can be caught out too.
The best way to tell in the old days was to try and copy the full amount of data to the stick, but who has 64GB of data lying around or the time to do it?
Almost definitely a bogus drive. I bought one from Hong Kong from a seller with good(ish) feedback and found that a 32GB drive turned out to be actually less than 4GB - loads of corrupt sectors etc.
I even left good feedback myself - I loaded it up with over 30GB worth of data and tested a couple of files - all looked ok so I left good feedback. I later tested the drive using a program called h2testw_1.4 and found that only about 4GB was uncorrupted.
Of course, you'd have to buy the drive to test it but I'd have to say, if you pay around £20 for one of these drives, it's going to be a duffer.
Don't do it.
Incidentally, I filed a Paypal dispute and managed to negotiate a £12 refund (I only paid £18), so I was pretty happy but then I think they figure the amount of refunds they give vs. the amount they sell.
Well using the program mentioned above the card which I was sold as 8gig is actually only 2gig and wont work in my camera because of this.
Does anyone know if its possible to repair the card back to its real size so it can be used?