I am looking for a cheap read-only storage medium with around 4 GB space, in most of my cases 1 GB is enough. The idea is to make the device bootable and use it as an replacement for a live CD (CD=slow). One example would be an SD card if I wouldn't have found out that they don't have a real physical write lock and the write lock is often realised in firmware, software etc.
Are there maybe special USB sticks that have a real physical write lock? I never know if there is any malware on the system where I use the medium. CD/DVD would be read-only, but it's so damn slow ): Thanks for any hint!