Advantech PCM-4862 Manual page 27

The built-in Enhanced IDE (Integrated Device Electronics) control-
ler supports up to two IDE devices, including CD-ROM drives, tape
backup drives, a large hard disk drive and other IDE devices. It also
supports faster data transfer rates and allows the IDE hard disk
drive to exceed 528 MB.
Connecting drives is done in a daisy-chain fashion and requires
one of two cables, depending on the drive size. 1.8" and 2.5" drives
need a 1 x 44-pin to 2 x 44-pin flat-cable connector. 3.5" drives use a
1 x 44-pin to 2 x 40-pin connector.
Wire number 1 on the cable is red or blue, and the other wires are
gray.
1. Connect one end of the cable to CN12. Make sure that the red
(or blue) wire corresponds to pin 1 on the connector, which is
labeled on the board (on the right side).
2. Plug the other end of the cable to the Enhanced IDE hard drive,
with pin 1 on the cable corresponding to pin 1 on the hard
drive. (See your hard drive's documentation for the location of
the connector.)
Connect a second drive as described above.
Unlike floppy drives, IDE hard drives can connect to either end of
the cable. If you install two drives, you will need to set one as the
master and one as the slave by using jumpers on the drives. If you
install just one drive, set it as the master.
Chapter 2 Installation 19