First, don't buy USB flash drives from Ebay. There are a lot of
counterfeits on there.
I've got a Rally2 here, and the others are just examples of other
fast ones. The Rally2 Turbo model won't suit you, since it only
goes up to 8GB capacity. 35MB/sec read and 30MB/sec write is
a reasonable upper limit for USB2 performance, so don't expect
USB2 flash to go much faster than that. (There are protocol limits.)
My Rally2 writes at about 18MB/sec (smaller files write slower with
flash, so writing 1000's of 2KB files will go a lot slower). If
you must store 1000's of 2KB files, ZIP them up before storing
on the flash.
http://www.ocztechnology.com/products/flash_drives/ocz_rally2_usb_2_0...
http://www.kingston.com/flash/dt_hyperx.asp
http://www.newegg.com/Product/Product.aspx?Item=N82E16820171372
For U3 equipped flash, you can usually get an uninstaller
program, to turn the device back into an ordinary USB flash
again. U3 is a concept used for portable applications.
http://en.wikipedia.org/wiki/U3
Last comment - USB flash is suitable for "transport" of a file,
but not as a long term storage solution. You should have
another copy of the file on some computer, and thus the
notion of "transport". There are too many horror stories of
having the only copy of a file on a USB flash, or
"my entire MP3 collection" and then the flash dies.
Don't add to the list of stories.
Paul