Starting XWin from a portable CD

[Fergus]

I'm running Cygwin-X from a portable device.
 From a write-able stick the start command
bin\run bin\XWin -nolock -nolisten local -logfile /dev/null -multiwindow &
works perfectly well. Notice the switch -logfile /dev/null which means 
the file XWin.0.log is not written.
(Slightly odd I know. The switch -logfile should specify a filename  not 
a directoryname, but it seems to work?)
However using an identical architecture as on the stick, but on a CD, 
the same start command results in
"Failed to activate core devices".
So is there something else that needs to be written and cannot be 
diverted to /dev/null (or somewhere write-able).
Or, if I know what it is, can I divert it or otherwise turn it off?
(Oh woe woe woe. I've lost count of the things that worked so easily on 
1.5 and somehow don't on 1.7, this start command on a portable CD being 
one of the list.)
Thank you!
Fergus
 



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