microSD card speed makes all the difference for Raspberry Pi

It’s a pity, given their importance, that manufacturers are prone to…creativity…in labeling; and that even the ones that don’t outright lie usually only report performance as judged by benchmarks built for the camera market(which, sensibly enough, focus on how fast the card can dump medium to large contiguous files from RAM to flash; because that’s what cameras do); and are largely silent on performance under the conditions encountered by a computer’s block device.

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