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alidav

brand new sandisk extreme pro at 18 MBs

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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. 

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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.

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