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USB disks and adapator for USB drives vary HUGELY in speed even on same USB2.0 host.
My "official" sold as a USB HDD is about 1/4 speed of my 2.5" 500 GByte SATA drives in a USB box. The 1T drives and video drives are an inbetween speed. My LAN is indeed faster than most USB flash or the Seagate "sold as a USB" HDD.
uSD & USB sticks vary dramatically in read speed and are much slower to write to. Sadly some budget laptops sold as SSD are using the same Flash chips as in SD cards!
Full size cards can fit 2 chips of size that fits in micro SD, hence the bleeding edge is x2 capacity.
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