SD slot "drives", comparing performance to others

Thought this might be of interest. I bought what is essentially an SD card, but is billed as a drive to go in the SD card slot of my 2015 rMBP. After poor performance that didn’t meet their claims (Max Read: 95MB/s, Max Write: 60MB/s)[1], I benchmarked different filesystems on it. Pretty remarkable differences. Only one trial per FS, so not rigorous, but interesting.

Edit: another fun fact: copied an 84GB folder to the JetDrive (twice), and only 44GB copied. No errors, no warnings. Back in the box you go.

Transcend JetDrive 256GB


  1. Yes, I know about “up to” and “max”, and the implications of “making up to $4000 a day using your computer.”

That’s $4000 a day using your computer AT HOME sir :slight_smile:

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Wow! I’ll call in the next 10 minutes for free information by mail!