NEC Express5800/340Hb-R N8800-047F User Manual page 97

Windows Setup and Operation 3-21
When the disk where RDR is set is converted to a dynamic disk, the area which
has not been synchronized (the area that no partition exists) will be synchronized.
When the system is shut down without shutting down Windows properly, for
example, by pressing the power button, the entire area of the synchronized disks
will be resynchronized after the system is restarted.