Asus P I-XP55TVP4 User Manual - Page 28

III. INSTALLATION 9. Primary / Secondary IDE connectors (Two 40-pin Block) These connectors support the provided IDE hard disk ribbon cable. After connecting the single end to the board, connect the two plugs at the other end to your hard disk(s). If you install two hard disks, you must configure the second drive to Slave mode by setting its jumper accordingly. Please refer to the documentation of your hard disk for the jumper settings. BIOS now supports SCSI device or IDE CD-ROM bootup (see "HDD Sequence SCSI/IDE First" & "Boot Sequence" in the BIOS Features Setup of the BIOS SOFTWARE) (Pin 20 is removed to prevent inserting in the wrong orientation when using ribbon cables with pin 20 plugged). TIP: You may configure two hard disks to be both Masters using one ribbon cable on the primary IDE connector and another ribbon cable on the secondary IDE connector. You may install one operating system on an IDE drive and another on a SCSI drive and select the boot disk through BIOS Features Setup. III. INSTALLATION (Connectors) IDE (Hard Driver) Connectors Pin 1 Secondary IDE Connector Primary IDE Connector 10. IDE activity LED (IDE LED) This connector supplies power to the cabinet's IDE activity LED. Read and write activity by devices connected to the Primary or Secondary IDE connectors will cause the LED to light up. IDELED + IDE Activity LED 22 ASUS P/I-XP55TVP4 User's Manual