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XenServer USB Notes
Attach a USB External Drive to a VM
http://support.citrix.com/article/ctx116673
To mount an external storage device in a XenServer Windows virtual machine use the following steps:
Connect the external storage device to XenServer.
Open the XenCenter Console from client computer.
Select the virtual machine to which you wish to add the external storage device.
Click on the Storage tab.
Click on Attach.
The storage device may or may not be automatically assigned a drive letter.
Click on Console tab.
Open Disk Management
Highlight the newly created unallocated partition
Select change drive letter and path
assign drive letter.
Create a Local SR