NEC Express5800 Series User Manual page 74

IMPORTANT:
A partition on the disk where the RDR setting is removed is not assigned a drive letter. To
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use the partition, assign a drive letter using [Disk Management].
If the disk contains a partition which cannot be unmounted, the OS needs to be restarted
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when remove it from the RDR virtual disk.
In that case, the following pop-up message appears. If you click [Yes], the OS is restarted
after two minutes automatically:
Windows Setup and Operation 3-13