Siemens SIMATIC Rack PC 547B Operating Instructions Manual page 46

Commissioning
7.4 Notes on operation
If you have shut down and restarted the system without installing a functioning new hard
disk, "unused" will be displayed for the corresponding SATA port. In this case, you will need
to shut down the system again and boot with the functioning hard disk. The new hard disk is
then assigned to a SATA port and can be included in the RAID array. The "Rebuild to this
Hard drive" command initiates synchronization of the RAID1 system.
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SIMATIC Rack PC 547B
Operating Instructions, 12/2007, A5E01127519-02