RodS57 wrote in post #19410265
In my experience as well.
I do need to explain that my card reader is USB2. Connecting to my 7D2's USB3 port results in a much slower transfer rate than using my card reader. I normally use the card reader but not always.
Rod
I first noticed how slow the 7D2's "USB3" was when I tried to make the program "DigicamControl" do a burst sequence to the computer, tethered, with the same computer USB port that gives me about 500MB/s with other things. I thought that it was unique to the tethered shooting, but one morning I needed to empty a card before I caught a bus, and the camera was already connected to the computer, so I started a copy of the card from the camera to the computer, and progress was not happening, and I checked the throughput, and it was only about 10MB/s, compared to the ~80MB/s I was getting with a USB3 card reader with that card, and the ~25-30 MB/s I remember getting with the last USB2 reader I used in the past.
There are so many products out there that do not deliver the bandwidth that they claim. Any claim that is exactly the theoretical limit for a type of bus ("5Gbps") should be immediately questioned. Honest numbers are usually not so well-rounded.