We believe that your issue has been closed by the upload of
Version 1.0.19 of grml-scripts from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.7
Date: Sun, 30 Sep 2007 16:04:31 +0200
Source: grml-scripts
Binary: grml-scripts
Architecture: source i386
Version: 1.0.19
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-scripts - some small scripts which should make life easier
Changes: 
 grml-scripts (1.0.19) unstable; urgency=low
 .
   * grml2ram: adjust for usage with new live-initramfs layout.
     Apply patch by Moritz Augsburger for identifying /dev/cdrom.
   * Adjust prepare_ramdisk.sh and prepare_tmpfs.sh for live-initramfs.
     [Closes: issue277]
Files: 
 fb9bf186be8130f542978261332f33d5 606 utils optional grml-scripts_1.0.19.dsc
 25c6a79ab21c10dd8232285363f91c30 206284 utils optional grml-scripts_1.0.19.tar.gz
 2e5e7b41b6e231019555450250cf71fe 228018 utils optional grml-scripts_1.0.19_i386.deb

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Done for grml2hd and grml-autoconfig, pending for prepare* stuff only now.

I'm working on live-initramfs integration within grml. As a consequence we 
won't have /UNIONFS available anymore, we should make sure we don't depend on /
UNIONFS statically. Well known candidates:

/usr/sbin/prepare_ramdisk.sh
/usr/sbin/prepare_tmpfs.sh
/usr/sbin/grml2hd
/etc/init.d/grml-autoconfig