Advantech i915GV-INA Series User Manual page 31

3. Primary IDE connector (40-1 pin PRI_IDE1)
This connector is for an Ultra DMA 10 0/6 6 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.
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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.
Chapter 1: Product introduction