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True read-only USB disks require hardware support. Otherwise, you can still erase the disk with the same tools you used to create it in the first place.

One method to create a read-only file system, that should work on most Linux distributions, is to use SquashFS.

  1. Create a directory (such as squash) and put the files you want on the disk in it.
  2. Create a SquashFS image of your directory. mksquashfs ./squash squash.img
  3. Partition the flash drive (such as with cfdisk or GParted). Make the partition the same size as or slightly larger than your SquashFS image.
  4. Write the SquashFS image to the partition you created. dd if=squash.img of=/dev/sdb1 bs=512.
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Jordan B

Lvl 5
3y ago

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