ext2 driver broken read only mode
The ext2 driver still tries to make changes in read only mode. There's an assert in block.cpp that triggers on writes in read-only mode. However, otherwise writes in read only mode is handled by just never writing to the disk, so it's a copy-on-write kind of mode, though it assumes as much ram as the harddisk size is available. It's best to switch to a real read only mode.