Attach VHD missing from Actions Menu of Disk Management (under Computer Management)

I have a windows server 2008 installation with Hyper-V role installed. Initially, the "Attach VHD" option existed under the Actions menu of Disk Management/Computer Management. However, it has disappeared now. Both Attach VHD and Detach VHD are no longer even options under the Actions menu:
 disk management console
It is a Windows Server Datacenter edition, SP2. I am not aware of any changes made to this system so I can't really track why the options disappeared. The virtual disk service is running. I've also tried just stopping the hyper-v service, still the Attach VHD does not show. Event viewer shows no errors regarding this. Any help greatly appreciated!
weblockedAsked:
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Greg HejlConnect With a Mentor Principal ConsultantCommented:
are you logged in and running disk management with admin credentials?

see this article for CLI vhd management - does this work?

http://technet.microsoft.com/en-us/library/gg318052%28WS.10%29.aspx

also try creating a new MMC for disk management....
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weblockedAuthor Commented:
>>are you logged in and running disk management with admin credentials?
Yes.

>>see this article for CLI vhd management - does this work?
No -- diskpart does not recognize "create vdisk" or any of the commands for vdisk. It just comes back and suggests other items like just "disk". Its as if the server doesn't understand the concept of virtual disks, although hyper-v runs fine.
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weblockedAuthor Commented:
That was a first step into me finding a solution.
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Greg HejlPrincipal ConsultantCommented:
what was solution?  that's a peculiar problem you had
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weblockedAuthor Commented:
well, I never fixed the "attach vhd" option. I dont think Windows Server Datacenter 2008 offers that, I think it becomes available only starting in R2. My underlying problem was that our script wasn't able to attach, and I thought it might be related. Turns out I had to install a vhd mount program, mount it once manually, then suddenly the script works.
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Greg HejlPrincipal ConsultantCommented:
i would suggest that you really want to be on R2 and with SP1!  it's all awesome! everything is sooo much smoother
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weblockedAuthor Commented:
I want to as well, but we already have customers on hyper-v and don't want to deal with the downtime and risks. Do you know the major advantages of R2+Sp1? I couldn't find any that would persuade me to accept the downtime for the clients.
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Greg HejlPrincipal ConsultantCommented:
R2 has the windows 7 kernel - much improved over the vista kernel.  I delayed a major deployment waiting for R2. it was worth it

SP1 adds dynamic memory functions for R2 SP1 VM's - allows you to over commit VM RAM

which allows you to run more VM's
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