The filesystem is mounted readonly to prevent damages due to poweroff and poweron. But there is a synchronous mounted Filesystem with a robust filesystem under /mnt/myCar which holds the variable data captured during operation.
The software could be found unter /opt/myCar. Additional there are some symlinks pointing to the correct destinations.
/mnt/myCar/rec
/mnt/myCar/etc
/mnt/myCar/log