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A pair of Seagate USB 3.0 HDD backup drives (1T but different models) were also about 1/4 speed of an ex-laptop 5400 rpm SATA in a 3rd party USB 3.0 SATA adaptor case.
A 6T 3.5″ desktop 7200 rpm SATA in a big USB 3.0 adaptor case is fastest backup by far. Nearly as fast as internal drives.
All tested on real USB 3.0 ports with USB 3.0 cables. The "A" connector is coloured blue and has 5 extra connections (at back on plug and at front on socket).
Most laptop 1T or larger SATA drives also seem to be very much slower than the best WD Black 512G laptop 5400 rpm drives.
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