I took a clone backup for windows failover cluster system from vmware system which used raw disks. Raw disks automatically converted to vmdk disk via vmware. I restored this clone backup as new standalone server. I started system but my disks were reserved status and I could not use these. I implemented below steps to convert disk status from reserved to online.

Error

Solution

Delete Reserved Disks Information From Regedit

You have to delete content from AttachedDisks parameter. You have to restart server after delete operation.

Set SAN Policy to Online

If SAN Policy is OfflineAll, you have to set this parameter to OnlineAll

Disks Make Online

Change Read Only Status to Read Write

Finally, you can use disks.

http://www.fatihacar.com/blog/how-to-change-disk-status-from-reserved-to-online-on-windows/