Didn't you get any "Not enough disk space to start recording!" messages?
VDR shouldn't even start a recording if there is less than 300MB of free
disk space.

What if a recording is started when there is 301MB of free space. Will VDR stop recording before it completely fills the disk? This might prevent the system from booting if the disk becomes completely filled and there are no separate partitions for /video.

BR.