Detach external USB HD from a Virtual Machine in Hyper-V

HyperV - Computer ManagementHi,
  I have a Hyper-V/Windows 2012 Server where I have a virtual machine with SBS2011 OS.
  I have a 2TB external hard drive to backup Hyper-V server. Please see the screenshot above. Then I purchased additional 2TB external hard drive to backup SBS2011 OS and its files separately and attached it to DC1 (name of VM). But I like to disconnect (or remove) it from the DC1 VM because it seems to be failing.

 What are the steps to follow to remove it from the VM and HyperV completely?

Thanks.
sgleeAsked:
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Svet PaperovConnect With a Mentor IT ManagerCommented:
While Hyper-V 2012 supports removing a SCSI attached disk, I would recommend shutting down the VM completely before removing the pass-through (physical) disk from the VM configuration – the one you highlighted in “Settings for DC1 VM” screenshot.
Then the USB disk can be removed as usual.

Note that even if USB disks are now supported as targets for Hyper-V they are still very slow (unless USB3) and I would discourage anyone from using them. iSCSI devices are much more stable.
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sgleeAuthor Commented:
Here is Edit Settings screenshot for DC1 VM.Settings for DC1 VMDC1 VM - Disk Management
About an hour ago I opened Computer Management in DC1 VM and attempted to format 2TB External USB hard drive and it has been stuck for an hour and it shows as "Basic Online" under Disk2 (please see screenshot of CompMgmt.msc in DC1).

How can I safely remove this USB from the DC1 VM?
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sgleeAuthor Commented:
Before shutting down the DC1 VM, should I change the disk2 status from online to offline?
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Svet PaperovIT ManagerCommented:
No, not in the VM. The pass-through disks must be configured offline on the Hyper-V host only.
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sgleeAuthor Commented:
OK. I will shutdown DC1 VM and remove it.
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sgleeAuthor Commented:
I removed the 2TB external USB HD safely from DC1 VM Settings while the VM was shutdown.
And then I started the DC1 VM successfully.

Thank you for your help.
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