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Wie viele schon geschrieben haben gibt es so etwas nicht auf dem Markt.
By "a USB" I presume you mean a memory key ("thumb drive") which plugs into a USB port, right?
If you can do it, you'd need a microcontroller in the middle to take the commands coming into the SD card and remap them to USB commands, which the memory key would then translate back into memory addressing operations.
Conceptually, possible. But I'm not sure you'd be able to get fast enough response through all those layers to meet the SD interface's specs.