My laptops have intel i5 & i7 cpus, usb 3 ports w/ drivers installed, ssds for the main internal OS drives, and SATA III for accessory drives inside the laptops. I use TeraCopy as default file copy app. When I plugin an external SATA hdd that's inside a usb 3 enclosure, into a usb 3 port and copy files to/from the interal drives, TeraCopy does give an estimated transfer speed in the title bar - which varies from 20-something to 90-something MB/s. I'm aware that file/folder types affect the transfer speeds, but my overall question is -- how can I determine for sure that transfer is occurring by means of the usb 3 standard? is there some app or Sysinternals utility that would indicate this? Or, is it a default logical inference that if the speed is showing to exceed "xxxx" MB/s, then that speed is automatically exceeding the usb 2 spec, and therefore means that usb 3 is functional ?? Hope my question is clear, if not I'll try again - thx for any helps.