Grub 0.97 hates my Zip disk?
 

I've built a new system with (as yet) no removable storage bolted in. I do have a USB Zip drive. I want to boot Linux off the Zip drive. I have another system with an IDE Zip drive and running Linux, from which I'm trying to build the boot disk. I've made an ext2 filesystem on partition 1 of the Zip disk and populated it with essentially my whole root partition plus the Grub images.

After trying lots of things I've come down to:

grub> root (hd2,0)
Filesystem type is ext2fs, partition type 0x83

grub> setup --prefix=/boot/grub (hd2) (hd2,0)
Checking if "/boot/grub/stage1" exists... yes
Checking if "/boot/grub/stage2" exists... yes
Checking if "/boot/grub/e2fs_stage1_5" exists... yes
Running "embed /boot/grub/e2fs_stage1_5 (hd2)"... 16 sectors are embedded.
succeeded
Running "install /boot/grub/stage1 d (hd2) (hd2)1+16 p (hd2,0)/boot/grub/stage
2 /boot/grub/menu.lst"... failed

Error 12: Invalid device requested

grub>

It doesn't say which device is invalid, or why it thinks it is invalid.

???