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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)

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    \$\begingroup\$ 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. \$\endgroup\$ Oct 19, 2021 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

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