May 1, 2021

Is a software write-protected USB as safe as a physical write protect switch?

If the threat is only viewing files (such as printing at schools on a public computer) and not wanting to have malware infect the usb/external and then my home PC, is software write-protect sufficient?

-If so, is there good, open source software to write-protect a drive?
-Bonus, off-topic question: If you fully encrypt a usb (such as VeraCrypt taking up all of the space), would it be impossible for anything to be written on the external drive without formatting it?

Thank you



My overwhelming preference is for an independently verified piece of hardware in between the system and the USB that has writeblocking built into the firmware.

But if you’ve tested your software writeblocker and know that it works, then that should be fine if you don’t have a proper hardware one available.

You can writeblock USB drives on windows by changing the registry- you don’t need external software to do it.

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