A guideline of our standard flash drive read/write speeds is as follows:
USB 2.0:
Sequential write speed range = 4~10 MB/s
Sequential read speed range = 15~25 MB/s

USB 3.0:
Sequential write speed range =10~20 MB/s
Sequential read speed range = 40~50 MB/s

http://www.flashbay.com/support/faq/...ad-write-speed