Beware when you go shopping for cheap USB thumbdrives in Hong Kong.
You can find many of these thumbdrives in 男人街 and 女人街. For HK$100, you can buy 5 to 10 of these drives. If you are not careful, you will end buying many fake drives among few working ones.
Here is how you can quickly identify the good ones from the fake ones before you buy.
Happy shopping, happy holiday in Hong Kong!