SBS backup dedicated backup disk is locked and will not eject

I have a system running SBS 2011.
SBS backup is configured to do a nightly backup to a set of dedicated external drives connected via USB.

For the past few nights we have had a problem with a particular disk being locked each morning - although the disks are USB connected, it is via an internal disk bay and the only way to eject them is via an eject button - but this will not work because the disk is locked.

The backup shows as completing successfully so I am not sure why the device is locked.

I tried using sysinternals handle to see what process has the disk locked, but because it is a dedicated backup disk, it does not have a drive letter, so I am not sure if it would even show up in handle.

A reboot last night did not resolve the issue, although the backup did run again after the reboot, so I am guessing that some part of the backup process is keeping a lock on the disk.

Any ideas how to troubleshoot further?
davids355Asked:
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PerarduaadastraCommented:
Is it a particular disk, or a disk set? What happens if you disconnect the USB lead and then try and eject the drive(s)? Is there a manual eject mechanism in case the electrical one fails?

Have you looked in the device manufacturer FAQs to see if this issue has already been reported? Failing that, get on the phone to them...
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davids355Author Commented:
^^Thanks.
It has transpired that it wasn't a hardware facility, its just a USB drive and its the windows "remove device" that is showing a busy status.
I have now asked the client to just remove the device and ignore the error.
I will see if it reoccurs with teh next device in rotation.
Strange because even after a post backup reboot lastnight, the device was still not removable.
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