RD1000 - cant eject

Dell T610 Server - SBS 2012 - Shadow Protect

Hi there

I have a Dell T610 Server which runs SBS2012.  We also have ShadowProtect to take regular backups of the server.  These backups, backup onto a RD1000 Internal Removable Disk device.

The problem, is that I can not eject the disks.  I receive the error "The disk is currently in use"

Using Process Monitor and handle.exe, I can see that 2 Open Handles exist on the removable disk.  These open handles originate from the exe called SMSvcHost.exe.

Does anyone have any ideas why these handles are open on this disk??  How can I close these handles?? 

I assume if I can stop/clos these open handles, I will then be able to eject the disk?

Many thanks

Lee Parvin