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No there is no reason for the SD card to have to be writable. You can put / and other filesystems into RAM discs. You can disable swap or run it over NFS and
by gerdesj 9y ago
No there is no reason for the SD card to have to be writable. You can put / and other filesystems into RAM discs. You can disable swap or run it over NFS and you can get other filesystems over NFS as well, so lots of options.
If you pass the correct options to the mount command, you get read only mode (funnily enough it is the ro option)