You must be aware of the following considerations and limitations when working with Writable Volumes.
Support for physical endpoints and Writable Volumes is available under the following constraints:
VHD In-Guest mode is the only supported machine manager mode.
Constant network connection is required.
Disable automatic Windows updates.
Detach the volume before performing any update to the OS.
Detach the volume when you log out. If the volume is not detached, profiles in the volume might be corrupted and cause the profile to be recreated when you log in again.
Detach all Writable Volumes when performing any revert, recompose, or refresh of the virtual machines.