NEC N8100-1575F User Manual page 361

< 2.5-inch hard disk drive model with Onboard RAID Controller installed >
In standard configuration, the cable is connected with the SATA connector on mother board. You
need not to change cable connection.
< 2.5-inch hard disk drive model with Optional RAID Controller installed >
Disconnect the SAS/SATA cable from the SATA connector on mother board, then connect it with
the connector on Optional RAID Controller.
IMPORTANT: In standard configuration of 2.5-inch hard disk drive
model, two SAS/SATA cables are connected. Be sure to connect both
SAS/SATA cables to the connectors on optional RAID Controller. You
cannot use the onboard RAID Controller and Optional RAID Controller
simultaneously.
Upgrading Your Server 11-47