transfer time calculation

From: http://techinternets.com/copy_calc?do

This File Transfer Time Calculator is used to determine the approximate time that a file would take to 
transfer over a particular interface . The speeds are optimistic because the actual inferface will be 
slowed down by overhead (ex: requests for the information, syncs, ...), more than one transfer at a 
time, and the interface not performing at the standard speed.
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*2From USB3.0 specification: "it is realistic for 400 MBps or more to be delivered to an 
application." - from section: 4.4.11 Efficiency
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