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:
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!