This is an FFS patch for the ffs 36.104 (31.10.91) and 40.1 (15.2.93) only.

You should really be using something newer than these, like FFS V46 from 
OS 3.1.4, or the third party PFS or SFS packages for large disk and >2GB
partition support.  Patched OS 3.5/3.9 FFS may also be better.