NEC DIRECTION SP B - SERVICE MANUAL 1998 Service Manual page 56

3-20 Option Installation
Figure 3-18 Removing the Bracket Screws
Slide the 3 1/2-inch hard disk bracket towards the back of the system unit
until it is free of the molded plastic.
Align the two screw holes on the hard disk with the two tabs on the
bracket. Slide the hard disk onto the tabs.
Figure 3-19 Aligning the Holes and Tabs