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Bug#655532: grub-installer: iso9660 filesystems and GRUB

Package: grub-installer
Severity: wishlist

DISTRIB_RELEASE="7.0 (wheezy) - installer build 20120111-00:07"

The installation to a USB stick (device /dev/sdc) proceeded smoothly

   Unable to install GRUB in /dev/sdc
   Executing 'grub-install /dev/sdc' failed
   This is a fatal error

The syslog expands on this (but truncates the error message):

   Jan 11 19:37:49 grub-installer: info: Installing grub on '/dev/sdc'
   Jan 11 19:37:49 grub-installer: info: grub-install supports --no-floppy
   Jan 11 19:37:49 grub-installer: info: Running chroot /target grub-install  --no-floppy --force "/dev/sdc"
   Jan 11 19:37:51 grub-installer: /usr/sbin/grub-setup: error:
   Jan 11 19:37:51 grub-installer:  
   Jan 11 19:37:51 grub-installer: hd2 appears to contain a iso9660
		   filesystem which isn't known to reserve space for
		   DOS-style boot. Installing GRUB there could result
		   in FILESYSTEM DESTRUCTION if valuable data is
		   overwritten by grub-setup (--skip-fs-p

Some background to GRUB's behaviour is in the thread starting at


The USB stick had held an isohybrid image, so information that there is
an iso9660 filesysten on it is in its first 64 sectors and this is not
touched by partitioning. It would be nice if this situation could be
recognized by grub-installer and for the installation to be capable of
continuing at the user's own risk after a suitable warning message had
been displayed.


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