Can't using fat32 drive as /tmp

Sat Oct 31 10:12:00 GMT 2009

I'm used to using ramdisk (assigned to drive X:, FAT-32) as tmp directory,
 rm -fR /tmp
 ln -snf /cygdrive/x/TEMP /tmp
after I updated to cygwin 1.7 (2009年10月4日), then startxwin failed.
(before update, my cygwin is 1.7 < 2009.7 )
/var/log/XWin.0.log:
 Welcome to the XWin X Server
 Vendor: The Cygwin/X Project
 Release: 1.7.1.0 (10701000)
 Build Date: 2009年10月25日
 Contact: cygwin-xfree@cygwin.com
 XWin was started with the following command line:
 XWin -multiwindow -clipboard -silent-dup-error
 ddxProcessArgument - Initializing default screens
 winInitializeDefaultScreens - w 1280 h 1024
 winInitializeDefaultScreens - Returning
 Fatal server error:
 Can't read lock file /tmp/.X0-lock
The lock file isn't created in /tmp when error dialog pops.
(If I add -nolock to XWin in startxwin.sh, it says invalid option. )
And I don't know how to change the default permission of FAT-32 mounts,
though the permission looks good /cygdrive/x is "drwxr-xr-x", and I can 
create any files/directories in the /tmp (-> /cygdrive/x/TEMP) in bash.
If tried another harddisk (not ramdisk) formatted as FAT-32, get the 
same error.
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