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Re:Testing an SD Card's true capacity by ehPReth on Tuesday July 11, 2017 @08:11AM (#14743449)
I've been using F3 (http://oss.digirati.com.br/f3/) to test new SD cards. Installable via homebrew and seems to work quite well
Re:Testing an SD Card's true capacity by randkyp on Tuesday July 11, 2017 @09:17AM (#14743886)
Yes. I just run f3probe for a quick capacity & speed test and then run a single-pass, random data badblocks test just to be sure. If there are any 'bad' sectors, I just pass the badblocks output to mkfs. Be careful with your choice of card reader/adapter though--some starts to get too hot and end up breaking the card under heavy testing!