3 ms·If you want to create read-only, use ext2. No point in using ext4 if you don't want journaling.by guappa 3y agoIf you want to create read-only, use ext2. No point in using ext4 if you don't want journaling.folmar 3y agoExtents are a useful feature even for readonly although the gain is smaller.cedws 3y agoYou can also use ISO9660.