Hi Remco,
I have set up a RamDisk (2GB) and NCrunch filled it with builds. It then complains that there is not enough space on the disk. (I also sent a bug report about it).
Can you detect that you are running on a low capacity - high speed disk (<20GB, xMB/s) and assume it is a RamDrive. Then detect that there would be not enough space to run a build (given that you did at least one before). And clean up enough old builds to make sure you have enough space for the current run. This would allow NCrunch to run forever using the RamDrive, at the speed of light...
Thanks,
Rudi