Asus P5B-E Plus User Manual page 52

4. JMicron
This connector is for a Serial ATA signal cable. This connector supports
a Serial ATA hard disk drive that you can configure for RAID through the
onboard Serial ATA RAID controller.
P5B-E PLUS SATA_RAID connector
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JMB363 Serial ATA RAID connector (7-pin SATA_RAID)
The JMicron JMB363 controller item in the BIOS is set to [IDE] by default,
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allowing you to use the connectors to build a RAID set. See section "4.4.6
Onboard Device Configuration" for details.
Before creating a RAID set using Serial ATA hard disks, make sure that you
have connected the Serial ATA signal cables and installed Serial ATA hard disk
drives; otherwise, you cannot enter the JMicron
BIOS setup during POST.
SATA_RAID
JMB363 RAID utility and SATA
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Chapter : Hardware information