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1. Turn off the computer and remove the battery.
2. Put on a grounded wrist strap.
3. Open your computer case. See your system manual for
instructions.
Caution. Opening the case may void your computer’s warranty.
4. Connect the 44-pin interface/power cable. Match pin 1 of
the cable to pin 1 of the interface connectors on the drive and
on the computer. Pin 1 is usually denoted by a stripe along
one edge of the cable. The location of pin 1 on the drive
interface connector is shown in Figure 1 on page 3. The cable
should be no longer than 18 inches (0.457 meters).
Caution. The printed-circuit cables used in laptop computers
are very delicate. Be careful not to tear them.
Mounting the drive
Mount the drive securely in the computer using M3X0.5 metric
screws in the four bottom mounting holes or the four side mounting
holes. You can mount the drive in any orientation. Be careful not to
strain or crimp the interface/power cable.
Caution. To prevent damage to the drive:
• Be careful not to bend the drive connector pins, especially
when plugging the drive into a fixed connector.
• Use mounting screws of the correct size and length.
• Gently tighten the mounting screws—do not apply more than
3 inch-pounds of torque.
• Do not insert mounting screws more than 0.15 inch.
Note. This drive meets industry-standard MCC mounting speci-
fications. When installing this drive in a fixed-mounting
4 Marathon 420sl Installation Guide, August 1995