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I was wondering if it is possible to access one SD card via two or more hosts via some sort of hub and write to it data sequentially (i.e host1 writes a bulk then hostN writes another bulk)

Ma250
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    Sure. The card won't really care who's writing to it, as long as it gets the correct signals for writing. It doesn't know how your circuit works. – user253751 Oct 19 '21 at 14:00

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You need a high speed demultiplexer designed for SD interfaces.

Take a look at this TI's transceiver: TS3A27518E-Q1

Enrico Migliore
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