Sony G Sd-cards: 30mb/s transfer rates to computer

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Joe Tam Senior Member • Posts: 1,046
Sony G Sd-cards: 30mb/s transfer rates to computer

Hi,

I have the UHS-II Sony G 64gb cards which are rated at 300mb/s read and write.  The cards seem to have suddenly slowed down tremendously when copying to my laptptop approximately 11gb and 8gb raw files from two A9.  I format the cards after each transfer to computer so the cards were fresh when I started shooting this morning.  I bought the cards from Uniqe Photo so I do not think they are fake.

Transfer speeds with activity monitor and chronosync on my Macbook 12" I see I am only getting about 30-35mb/second transfers via USB C.  I have tested the cards with several UHS-II USB-C card readers and the results are the same.  I also tested with Startech dual SD-UHS II card reader and the results were just as slow.

I checked data transfer speeds with an external Samsung 860 SSD connected via USB-C to my laptop and was getting 414mb/second transfer speeds.

I reset smc and pram and still the same performance.

 Joe Tam's gear list:Joe Tam's gear list
Nikon D5 Nikon D850 Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Nikkor 400mm f/2.8G ED VR II Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II +7 more
Sony a9
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