[blue68f100]

256meg may be a little low. Installer scripts errors at times will just trigger another step to create what is missing. I see this quite often. You also get these errors when the HD/share is full. This problem was corrected in v4 when they expanded the partitions. Did you test to see if it's still failing to boot.

Were you running the AV, was optional package for the 4200? So this may not even apply. If AV this may need to be un installed to free up some HD space. There is an uninstaller script that can be run from the cmd line, but you may not be booting far enough to execute.

Have you installed or added any software to the OS's for special functions?

Have you tried running SpinRite to check the remaining drives?

There were some issues like this several years ago, but I do not recall what was done.