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SD cards can also have a switch to make them read only.

• gnabgib 2y ago
  They have a switch that requests the host doesn't try and write, but it's not read only: It is the responsibility of the host to protect the card. The position [i.e., setting] of the write protect switch is unknown to the internal circuitry of the card https://en.wikipedia.org/wiki/SD_card#Write-protect_notch https://en.wikipedia.org/wiki/SD_card#Write-protect_notch
  • dwattttt 2y ago
    Ah, security via the honour system. Unbeatable
    • ykonstant 2y ago
      The CIA would never spy on me: they promised!
    • folmar 2y ago
      It's usability feature, not security. For cameras/floppy-like usage it's to prevent accidental write/erase errors, which are quite common in managing a large stash of cards.