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I believe speed issue is a function of two things brand of card and type of card (SD, CF...)[not getting into speed ratings on some of the cards here]
I think CF is generally faster than SD (and cheaper), however, my 256 Sandisk CF is noticeably slower than my 256 Lexar SD (copying files on the device and transferring via active-suck)
For further comparison, my Lexar SD was faster copying files than a friend’s 256 Sandisk SD card.
From your specific instance it looks like the CF is faster than SD (typical) and may be compounded by the brand of the card. I have no experience with Kinsgton media so I cant say much about brands here, but the general consensus is the Lexar is near the top.
This is a pretty gross generalization, so YMMV.
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