Attached USB drive not visible in Hyper-V computer

A client is using Microsoft Small Business Server 2011 on Hyper-V server. Currently two USB drives are used for the internal SBS 2011 backup. For security reasons one of them is always kept at an external location.

Because of current Hyper-V limitations we have to connect the drives to the Hyper-V server, set them offline with the diskpart cmd tool and attach them to a virtual SCSI controller; only then the drive can be used inside of SBS 2011 for backup purposes.

Today I tried different ways to switch to the other USB drive and disconnect the one formerly in use. I believe the trouble started because at first both harddisks where connected when I selected the other one in Hyper-V manager.

After disconnecting the "old" drive Hyper-V manager showed the new "SCSI" drive but it wasn't visible in the virtual SBS 2011. After several virtual reboots, configuration changes (remove drive, add it again), a physical server reboot I finally removed the virtual SCSI controller, readded it, readded the drive ... and it was once again visible in SBS 2011 and backup worked without any problems.

The moral for me: When using the current Hyper-V 2008 R2 Server make sure that you first shutdown the virtual machine, remove the backup USB-drive from the virtual machine configuration, remove the physical drive from the host, add the other physical USB backup drive, add the drive to the virtual machine configuration ...

If one of my readers knows of a more user-friendly way to handle the described scenario I would be very grateful to hear about it!