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Due to security reasons, I need an USB that has the switch to set it physically read only, because in this way I can be 100 % sure that it can't get infected when I connect it to an infected device. I can not find any good and trusted brand that sell USB with that switch in my country, so people suggested me to use and SD card that has that switch. I found some good SD cards with that switch, but sadly I need a SD card reader to connect it to USB ports (something like this https://amzn.eu/d/ewl1uU9).

So I'm wondering: If I turn on the read only switch of the SD card, I put the SD card in the SD card reader and I connect the SD card reader to an infected PC, could a virus still infect the SD card reader firmware? If the answer is yes (I afraid it is), are there any other solutions to connect a USB or something similar to a PC and be physically protected?

Yes, I'm pretty paranoid, but I was used to use DVD to do that stuff, but now with 4 or 8 GB you can't do much, and some PC manufacturers are sadly removing DVD players

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  • There are various USB write blockers available
    – paj28
    Commented Apr 20, 2023 at 16:33
  • @paj28 I saw them, but they are so expensive compared to the good old DVD
    – koxige9113
    Commented Apr 20, 2023 at 17:02

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The Write Protect on the SD card standard is essentially a Honor System. The card reader host must choose to honor it. That's it.

https://electronics.stackexchange.com/questions/325868/how-does-sd-card-write-protect-switch-work

If the malware can get the sdcard reader to ignore this, it will be writable.

There are Write once read many (WORM) USB drives. They are not cheap though.

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  • damn, so I can't use an SD Card. I saw the WORM USB, but damn 32 GB are 150 $. I miss DVD so much :(
    – koxige9113
    Commented Apr 20, 2023 at 17:01

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