Asus SCSI 320-2 - Manual (Page 17)

LSI MegaRAID Userʼs Manual
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3. If the setting is to meet individual requirements, please select Custom
Configuration. You could also let the Configuration Wizard set up
a RAID automatically by selecting Auto Configuration. Click Next to
continue.
4. Hold on the Ctrl key on your keyboard and select with your mouse
five ready drives, then click on Accept Array to setup Array 1. At least
three hard disks are needed for establishing RAID 5.