Epson ActionTower 8600 User Manual page 108

5. Replace the bracket as shown below and secure it to the back
panel with the four screws you removed earlier.
6. To connect the drive cables to the drives in the rear internal
bracket, first locate pin 1 on each drive's connector. The
number 1 or 2 may be printed on the drive's connector or
circuit board to identify the side containing pin 1.
Installing and Removing Tower Drives 5-17