The MassFS options should be documented - although that may be different for release versions (it's mainly up to Stu to decide what documentation is released).
The options have been through various revisions, and it's possible that it's a legacy one which is ignored now (and should be removed). I have a reasonable idea what "S" would mean, but I won't say what it is unless Stu thinks I should
Geeks celebrate RISC OS time epoch Clock-watching nerds rejoiced this week as all modern ROS machines reached a mildly baffling milestone. The OS keeps track of the current time by storing it as the number of one hundredths of a second elapsed since midnight January 1, 1900 - and this figure ticked over to 0x5000000000 in the early hours of Tuesday, provoking excitement among some. 8 comments, latest by druck on 24/11/08 9:02AM. Published: 20 Nov 2008