alidav Posted March 5, 2018 Report Share Posted March 5, 2018 I am testing a brand new Sandisk extreme pro 64 GB, I put in sd reader inside my mac book pro, and black magic gives just 18 MBs, my mac is a mbp 2009, the sd reader is usb2 bus based, so I should get at least a higher speed rate than 18. whats wrong. Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted March 5, 2018 Report Share Posted March 5, 2018 USB2 bus top speed is (theoretically) about 35MBps throughput. The reader is likely not operating at speeds maxing out the specs. And your computer is almost a decade old, which is “ancient technology “ in computer world. So even if there is nothing wrong with the card, 18MBps may be what to expect. Quote Link to comment Share on other sites More sharing options...
alidav Posted March 7, 2018 Author Report Share Posted March 7, 2018 yes I tested it on a usb3 based card reader and it was ok. Quote Link to comment Share on other sites More sharing options...
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