Epson ActionTower 8000 User Manual page 119

Before you install a drive, identify pin 1 on the drive connector
so you know where it is when you connect the drive cable. On
a hard disk drive, turn it over so you can see the circuit board,
as shown in the next illustration. Locate the side of the drive
connector containing pin 1, indicated by a "1" printed on the
connector or the board (a "2" may be printed beside the
opposite row of pins to indicate the side of the connector
containing pin 1). On a CD-ROM drive, pin 1 is next to the
power connector.
For hard dish drives, you may also want to make a note of the
drive parameters (such as cylinders, heads, etc.), in case the
SETUP auto-sensing feature cannot detect these parameters
when you configure the drive. The parameters may be listed on
a drive label or in the drive documentation.
Installing and Removing Drives in the Tower Computer
6-4