Virtual machine will not start due to dvd drive locked by other process

I have posted this earlier and thought it was solved but this keep hunting me!!

I have a host server running Server 2008 R2 FULL with the Hyper-V role enabled.
I have installed two virtual servers.
After restarting the host only the first virtual server is starting.
When the second try to start Hyper V manager returns an error:

"An error occured while attempting to start the selected virtual machine.
Failed to open attachment B: Error: The process cannot access the file because it is being used by another process."

Attachment B: is the physical letter of the dvd drive on the host server.
This used to be drive letter F: but after posting this Q the last time I changed the drive letter which caused the machine to start!!
OhmitAsked:
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Sushant GulatiConnect With a Mentor ConsultantCommented:
http://www.petri.co.il/hyper-v-quirks-that-take-some-getting-used-to.htm

That's by design by the way. You can't get this functionality while mapping the CD/DvD drive simultaneously into 2 VMs. Though you can mount an ISO ( image file ) in N number of VMs but this a backdrop using HyperV.

Hope this helps..!!

Good Luck..
~SG~
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Sushant GulatiConsultantCommented:
Did you check the boot order? And make sure other Virtual machine does not have anything ISO mounted though the DvD can be mounted simoultaneously in both the VMs, I just to make sure if we should restrict the VM not use the DvD as their primary boot device no files are locked by the DvD.

I would check the events generated in the event viewer for HyperVisor to go in more depth.

http://www.techrepublic.com/blog/datacenter/search-hyper-v-vm-management-services-log-for-events/4362

Let me know your findings..

Thanks..!!
~SG~
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OhmitAuthor Commented:
Well.
I changed boot order from CD to IDE - no result!

Nothing is ISO mounted!

I dont see ANY errors in the log??
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OhmitAuthor Commented:
If I remove the DVD drive from the Virtual Machine it can start!
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OhmitAuthor Commented:
*GGGG* I really didn't know that!!!
Well ok - problem solved :-)
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Sushant GulatiConsultantCommented:
Able to boot?
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OhmitAuthor Commented:
yep :-)
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