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An SD Card (Secure Digital Card) is an ultra small flash memory card designed to provide high-capacity memory in a small size.

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How can I speed up SD card writing speed (using /dev/disk*) on a MacBook Pro?

Just ran into the same problem and it seems to be that /dev/disk* is slow because it is buffered. If you use the corresponding rdisk device (ex: /dev/rdisk1s1) you should get the speed you expect. Thi …
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