Advantech HMI-640S - Manual (Page 57)

Chapter 4 CPC-2245N Main Borad 47
Note : IDE pin 28 must pull 470 ohms resistor to GND.
Note : 33 ohms damping resistors is recommended to
connect near IDE connector. Please refer to Fig.
2-2 below.
Note : We do not recommend connection to the following
IDE HDD models of Seagate: ST 31276A, ST
31720A, ST 32531A, ST 33240A or ST 34340A
Figure 4-2: Damping resistor