We believe that your issue has been closed by the upload of
Version 0.9.23 of grml2usb from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Hash: SHA1

Format: 1.8
Date: Fri, 02 Apr 2010 18:32:25 +0200
Source: grml2usb
Binary: grml2usb
Architecture: source all
Version: 0.9.23
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml2usb   - install grml system / ISO to usb device
Changes: 
 grml2usb (0.9.23) unstable; urgency=low
 .
   [ Ulrich Dangel ]
   * Only ask questions if options.force is not set. [Closes: issue833]
Checksums-Sha1: 
 82f499322ff845363cf359a1d9011d0ad3739ffe 876 grml2usb_0.9.23.dsc
 be7cae0dbb1597be5b67404497002448f7d2c1f8 1241515 grml2usb_0.9.23.tar.gz
 74fb071d5028a12985af77da495db80732c89305 864036 grml2usb_0.9.23_all.deb
Checksums-Sha256: 
 60f7b7d08a2a2a43dde4732b3d66687362a8c865e888d48119e6ad8e290fead7 876 grml2usb_0.9.23.dsc
 a4bfc2f592f83fc727883df7b4787b5ddf68eaa16c8e6d538996e32870a498ce 1241515 grml2usb_0.9.23.tar.gz
 84d5b55c251e9bcba59d67069687c0b6ca6405097863d8bdfe8c07d643ca8bc4 864036 grml2usb_0.9.23_all.deb
Files: 
 db7d7cbcbcfa74f1485cea67225c652f 876 grml optional grml2usb_0.9.23.dsc
 3ee50663152e1b89988a6dd19397a36a 1241515 grml optional grml2usb_0.9.23.tar.gz
 0c8b2afe31516e932f22e6b2775bfd49 864036 grml optional grml2usb_0.9.23_all.deb

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when running grml2usb --force /live/image /target grml2usb raises a question if
/target is not a removable device.