Install GRUB to usb thumb drive

Hi,
I'm trying to install grub to a usb thumb drive for a portable arch install. I've read the wiki for grub and installing arch on a pendrive but i'm receiving the following error no matter what i do.
sh-4.3# grub-install /dev/sdb
Installing for i386-pc platform.
grub-install: warning: Attempting to install GRUB to a disk with multiple partition labels. This is not supported yet..
grub-install: warning: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged..
grub-install: error: will not proceed with blocklists.
sh-4.3# grub-install /dev/sdb1
Installing for i386-pc platform.
grub-install: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map.
sh-4.3#
Anyone know what this means and how i can install grub?
Thanks.

Then verify that your installation is corresponding with the UUID rather than addressing by kernel name.
What says
$ ls -lF /dev/disk/by-partuuid

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    Moderator note: changed subject to match new content.  Was: Prepare an usb thumb drive, to boot windows 7 in UEFI mode
    I'm just a volunteer. I like to help others where I can. Do my ideas work? I hope so. o_O
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