Re: [Trisquel-users] Questions making boatable usb with writeprotection and some stuff

[firefoxbugreporter]

2. You might find USB sticks that have hardware switches, but they are  
usually hard to find. This doesn't guarantee that they can't be written to.  
Some might leave write restrictions to the system, but inform the system they  
are locked. Even if they allow only reading, this is usually implemented in  
the drive firmware, and it might be upgradeable. This means, a new firmware  
can be installed, and the drive can be written to.

BTW, the FSF is okay with this kind of firmware, because it is not meant to  
be changed by the user, and doesn't run on the main CPU.