Hyper-V

If disk is offline

Now type “list disk”, which will give this message: 
Disk ### Status Size Free Dyn Gpt 
Disk 0 Online 30 GB 0 B 
Disk 1 Offline 50 GB 1024 KB    

In my case, disk 1 was offline so I typed “select disk 1” which provided: 
Disk 1 is now the selected disk    

Now type “attributes disk clear readonly”. 
Disk attributes cleared successfully. 
And to check if all the settings are now correct, type “attributes disk”. 
This will give an output something like: 
Current Read-only State : No 
Read-only : No 
Boot Disk : No 
Pagefile Disk : No 
Hibernation File Disk : No 
Crashdump Disk : No 
Clustered Disk : No    

After the last check has been successful, type “online disk” to bring the disk online. The disk should be available right away in Disk Management. If not the case, close and re-open Disk Management.  

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