Reinstalling grub - error

[celtic426]

***Edit: Solved, read second post.



Hi, I am following these steps to restore grub after installing windows 7:

http://members.iinet.net/~herman546/p20/GRUB2%20Bash%20Commands.html#Re-install_GRUB_from_Live_CD


When I attempt to give the command,

sudo grub-setup -d /media/Ubuntu910/boot/grub -m /media/Ubuntu910/boot/grub/device.map /dev/sda

i get this error:

error: cannot open `/dev/sdb' while attempting to get disk size


Can someone please help? I'm not sure what to do.

Here's my Gparted screenshot:
http://img34.imageshack.us/img34/9679/imagecza.png


sda1 is WinXP
sda3 is Win7
sda5 is storage
sda8 is Ubuntu910

Thanks!

[celtic426]

Despite the error, grub was still installed and working upon reboot. So no problem. I should have known that sdb was a different hard drive and not pertinent to the situation.