USB 3.0 SanDisk Ultra 16GB with a read speed up to 100MB / s (SDCZ48-016G-U46) (Personal Computers)
Quick Key, a ratio of 3 in writing time was found by comparison with a USB2 key in my possession (the manufacturer says up to 5 times). The gain, however, is less spectacular than with an external drive used on USB2 or USB3.