RDX - unable to do RDX restore - not seeing RDX drive

[Raddersred]

We have a Proliant server with an internal (USB-connected) RDX backup drive.

I am using Vsphere ESXi 5.1 (free version).

The main VM is running Windows Server Essentials 2012 and I have installed the HP RDX backup solution in that VM which has been happily backing up to the RDX drive.

Restore test:-

I have created a new VM identical to the original (in terms of hardware).

I have removed the RDX drive from the original VM and added it to the new VM (add USB controller first, then add USB device - HP RDX device).

I have set the new VM to boot from CD so it runs the HP RDX software from CD on booting (this is how you start a restore according to the docs).

The HP software loads ok but it is reporting that it can't 'see'  the RDX drive, so doesn't offer me the option to do a restore.

No errors. It just tries to list available RDX volumes but doesn't show any.

Any help appreciated.

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MORE INFO

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Just spotted an error message that appears just after the HP splash screen:-

modprobe: FATAL: Error inserting hid_dummy (/lib/modules/2.6.29-rc6-gcs/kernel/drivers/hid/hid-dummy.ko): Input/output error - See attached