I've been using a Rosewill USB 3.0 card reader which has worked OK. Last week, one of Amazon's Deals of the Day was Transcend memory cards. I don't shoot 4K, but the 95 mb/s read speed for their UHS3 cards was appealing. The card worked OK in my Sony Handycam, but didn't seem any faster, so I ran some ATTO disk speed tests. What a disappointment.



The next day, a $5 Transcend USB 3.0 card reader arrived. http://www.amazon.com/Transcend-Information-Card-Reader-TS-RDF5K/dp/B009D79VH4/ref=sr_1_1?ie=UTF8&qid=1407166674&sr=8-1&keywords=transcend+card+reader+usb+3.0

I re-ran the tests plugging the new card reader into the Rosewill USB 3.0 slot on the front. What a difference.



I had also ordered a couple of their UHS1 cards and found a big drop in write speeds, but pretty much the same read speeds.



I then tried a couple of older Sandisk Extreme Cards. First, the 45 mb/s card.



And finally, a Sandisk Extreme 30 mb/s card, which had a lower write speed, but the same read speed.



My takeaway from this--try the $5 card reader. The numbers pretty much speak for themselves.

wwaag