You might come across some limitations when working with writable volumes.
Support for physical endpoints and writable volumes is only given under the following constraints:
VHD In-Guest mode is the only supported machine manager mode
Constant network connection is required
Automatic Windows update should be disabled
Any update to the OS should not be performed with writable volumes detached
Detach writable volumes when performing a user log out. Profiles in the writable volume might be corrupted and on next login cause the profile to be recreated.
All volumes should be detached when performing any revert, recompose, or refresh of the virtual machines.