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I'm going to buy a new SD card to be used in my car's audio player. What I would like to know is, if I buy a micro SD card with adapter, will it provide the same read/write speed as a standard SD card of the same model? Does using adapter affect speed?

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up vote 10 down vote accepted

The adapter is basically just a bunch of wires; they use the same signaling. The class of the device will determine the speed, not the adapter.

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As far as my experience goes, there's no difference between using an SD card vs a micro SD card.

I've even booted full linux distributions from a micro-sd card (8GB) with a SD adapter

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