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    That's a good point about using RAM to prevent writes to the disk, but I don't think that it would resolve the fundamental issue, which is slow SD card write speeds. Consider the case of just writing an image to an SD card (dd if=someFile.img of=/dev/mmcblk1); nothing else is using the SD card, but the process still takes way too long. I should try a class 10 card, but I don't think that the card is the bottleneck, so I don't expect to see a major difference. Commented Aug 15, 2017 at 20:47