Follow-up Comment #1, bug #47980 (project grub):
My idea about the write command is that it could serve as a
replacement for kernel parameters whenever an OS needs to be
chainloaded. That way also non-directly supported OSes like Windows or DOS or
any new not yet supported ones could be customized.
The command found for fdubcd.img.gz is:
write --offset=15 /bin/setargs.bat ubcdcmd=keydiskrn
It simply replaces the given file for the given string at the given offset.
The file itself contains sufficient spaces at the given position in order to
hold for the parameter passed via write. As already said there are no
additional security/safety considerations necessary as long as the file
resides inside a RAM disk.
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