On 8/21/2025 9:37 PM, Jon LaBadie wrote:
On Thu, Aug 21, 2025 at 08:36:25PM -0600, home user via users wrote:

(very strongly preferred)
* write lockable and unlockable, just like them old 3.5 inch, 1.44 MB
floppys.  Note that I want hardware locking and unlocking (like those
floppies), not software locking/unlocking (such as with command line
options).

(preferred)
* re-writable as opposed to write once only.

...

I don't know about everything that's out there.  I'm mainly trying to
find out if there's something else that I don't know about, other than
USB sticks, optical discs, and sdxc cards.

Maybe the sdxc cards fill your requirements.
Most have a write protect switch.

In my original post, I ruled out sdxc as too slow.
But your post got me taking a second look.
sdxc is too slow, but SD Express is a lot faster.  I'm guessing that, to get the high speeds, it would have to connect directly to the "bus" rather than through a USB port.  And it looks like SD Express is lockable.

Thank-you, Jon.

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