[Xen-users] Problems with attaching block device to DomU

["sagnik dhar" <sagnik.dhar@xxxxxxxxx>]

I am running Xen on Ubuntu. I am trying to attach a block device(usb pen drive) to domU. When i plug in my pen drive, it gets attached to dom0 on /dev/sdb1. I executed the command 
xm block-attach 3 phy:/dev/sdb1 /dev/sdc ro (3 is the guest vm's id)

i get the error.
Error: Device 2080 (vbd) could not be connected.
Device /dev/sdb1 is mounted in the privileged domain,
and so cannot be mounted by a guest.

Where am i going wrong? Is the command correct in the first place?

Thanks for the help.
Sagnik
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