Those little plastic µSD-to-SD card adapters, of which you may have a bunch lying around since they are often included with new µSD cards, make excellent µSD card sockets:
There are many libraries (in C for the Arduino, for example) which support accessing SD cards from an embedded µC. These all rely on a well-known feature of these cards of supporting SPI:
The only tricky bit is getting them into that mode.
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