I have an external USB 2Tb drive I'm trying to use with a xen guest. Xen Center 6.1 sees the drive in the removable storage repository and I can assign it to a guest.
But the guest (tested Server-2012 and Windws7-x64) see it as an uninitialized disk in disk manager, with a size >14500 Gb (!) and give an I/O error when I try and initialize it either as MBR or GPT.
The drive tested and formatted perfectly when plugged into a regular machine.