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Message: <blockquote data-quote="WayneF" data-source="post: 326878" data-attributes="member: 12496">That's a tough question, certainly I don't know.  No clue if this is correct, but ....The difference is the speed test heroically tries all block sizes, and shows a graph about how the USB speed varies drastically with block size.   Which block size does the card use?The computer copy is influenced by the card block size, which was set up by formatting.  Again, as shown, chkdsk will quickly show the cards sector size.  FAT32 ought to be 32KB.If you are doing anything special about formatting the cards, then don't do that.  Simply let the camera format them the way it knows to do it.A camera format now and then is the best way to delete files, a clean reset so to speak.</blockquote>