500GB drive + SFS problem

[Mark]

From changesSFS_NEW.txt:

- The limits mentioned in the 1.245 notes were wrong, sorry. The actual
  partition size limit of SFS 1.x is 128 GB, no matter which blocksize
  you are using. Changed the checks to the actual limits. You can
  continue to use too large partitions, but you may get "disk full"
  errors (instead of a trashed partition) even if there is still free
  space on the partition.