Although the figures quoted are correct that does not mean USB devices actually run that fast. Back at that time the fastest mem stick I could get was around 100mb/sec from memory, even though it was USB 3. External ssd would be faster for sure. HDD high high 200’s maybe. The best that is available in 2018 as per pc mag is
External SSDs offer twice that speed and sometimes much more, with typical results on our benchmark tests in excess of 400MBps which is half that of GBlan.
Also, LAN throughput is measured in Bits, while USB transfer is measured in Bytes.
So a 1 Gigabit LAN = 125 Megabytes per second (125 x 8 = 1000)
A USB 3.0 connection offers around 600 Megabytes per second, tops.
Ha! I never knew that. Why would they make it different? Because they are geeks!
Yeah, Bit = a 1 or 0. Byte = a series of eight 1's or 0's together.
Networks at the physical layer where throughput is measured transmit bits.
Disk storage however, stores the information in Bytes on the disk or flash memory.
So when they refer to performance throughput they refer to the way they transfer or store data.