 How to find out how grub names your disks/partitions
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While the grub menu is shown, press "c" for a command line interface.
Then, write "cat (" without the quotes and press tab for autocompletion.
Grub should respond with something like:
 Possible disks are:  fd0 hd0
This way you can see how grub names your disks.

Continue with writing one of the disks, e.g. "cat (hd0" and press tab twice.
Grub should respond with something like:
 Possible partitions are:
   Partition num: 0,  Filesystem type unknown, partition type 0x7
   Partition num: 1,  Filesystem type is ext2fs, partition type 0x83
   ...
This way you can see how grub numbers your partitions.

Continue with writing one of the partitions: "cat (hd0,1)/" and press tab.
Don't forget the slash (/). Grub should respond with something like:
 Possible files are: lost+found var home media etc cdrom bin boot dev ...
This way you can see the files in your partitions, to help you distinquish
between partitions or to locate the kernel.

More help: http://users.sch.gr/alkisg/tosteki/index.php?topic=1451.0
