Asus RS520-X5/PS8 - Manual (Page 50)

4-8 Chapter 4: Motherboard information
2. IDE connector (40-1 pin PRI_IDE1)
This connector is for an Ultra DMA 100/66 signal cable. The Ultra
DMA 100/66 signal cable has three connectors: a blue connector for the
primary IDE connector on the motherboard, a black connector for an Ultra
DMA 100/66 IDE slave device (optical drive/hard disk drive), and a gray
connector for an Ultra DMA 100/66 IDE master device (hard disk drive). If you
install two hard disk drives, you must configure the second drive as a slave
device by setting its jumper accordingly. Refer to the hard disk documentation
for the jumper settings.
4.3 Internal connectors
1. Floppy disk drive connector (34-1 pin FLOPPY1)
This connector is for the provided floppy disk drive (FDD) signal cable. Insert
one end of the cable to this connector, then connect the other end to the
signal connector at the back of the floppy disk drive.
Pin 5 on the connector is removed to prevent incorrect cable connection when
using a FDD cable with a covered Pin 5.
• Pin 20 on the IDE connector is removed to match the covered hole on the
Ultra DMA cable connector. This prevents incorrect insertion when you
connect the IDE cable.
• Use the 80-conductor IDE cable for Ultra DMA 100/66 IDE devices.