There are many around ...be careful in checking the speed specification.
They can vary from like 1 meg sec. read & write to 25 Mb sec....Any advert
won't
necessarily tell you...
Sometimes USB flash drives are defined in CD speed terms e.g. x50 x100 etc.
The fastest are those marked 'ReadyBoast' for Windows VISTA use.
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You have only specified one variable out of many that
differentiate flash drives. If you are more clear on what
you do or don't need, you can probably just go to a larger
seller like Newegg.com or whoever and find it yourself.