Quote:
Originally Posted by jswinden
...... To test I copied a folder of files containing 3.37 GB of information from my MBP's internal SSD to the external storage devices/cards, and of course recorded the transfer time. ........
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To copy a lot of small files to a HDD is waaaay slower than to a SSD or a fast card. The access times of the latter two is much lower, thus perceived writing speed is much higher.
Try to test with
one 1 Gb file. Then you will see that the transfer speed of the portable HDD is (up to 4x) higher than what you tested.