I'm sure you know this, but for the young'uns here: It's even worse than that. The SD card spec provides for a "write protect notch" and corresponding physical

I'm sure you know this, but for the young'uns here: It's even worse than that. The SD card spec provides for a "write protect notch" and corresponding physical switch. On the card itself. But, it's optional and it's not implemented by the card. Instead it's up to the host software to honor it. Morons! USB thumb drives should also have a physical switch. But they don't. I'm from the old school of "no ring, no write" on 9 track tape. Saved many people's asses back in the day. But that knowledge has been lost in time ... like tears in rain.