I've been able to install the Hurd to hdb1using the debian K3 iso image, and can mount it with mount -t ext2 /dev/hdb1 /mnt/hurd, but It does not want to boot. Here is an ls from the mount point:
bash-2.05b$ ls
bin doc games include libexec mnt sbin src var
boot dpkg-hurd home info lost+found native-install servers tmp
dev etc hurd lib man root share usr
Perhaps you can see something wrong with the automagic kernels part of my /boot/grub/menu.lst:
## ## End Default Options ##
title Libranet GNU/Linux, kernel 2.4.20
root (hd0,0)
kernel /boot/vmlinuz-2.4.20 root=/dev/hda1 ro hdd=scsi
savedefault
boot
title Libranet GNU/Linux, kernel 2.4.20 (single user mode)
root (hd0,0)
kernel /boot/vmlinuz-2.4.20 root=/dev/hda1 ro hdd=scsi single
savedefault
boot
title GNU/Hurd K3
root (hd1,0)
kernel /boot/gnumach root=hd0s1
module /boot/serverboot
savedefault
boot
### END DEBIAN AUTOMAGIC KERNELS LIST
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