How To Migrate vDisks From One Store to Another in Provisioning Server 7.6.
Complete the following steps:
Create a new store from PVS console.
Copy vDisks (VHD file) from old store to new one.
Grant full control to everyone on store.
Import the vDisk from newly created store in PVS console.
Mount the vDisk on target devices.
Should be able to boot the target devices from new store.