NEC SP B-Series - Manual (Page 84)

Disassembly and Reassembly 5-7
Removing the 5 1/4-Inch Device Screws
4. Slide the device out from the front of the system unit.
Optional 3 1/2-Inch Hard Drive Removal
Remove the optional 3 1/2-inch hard drive as follows.
1. Remove the system access cover and front panel as previously described.
2. Label and unplug the hard drive power and signal cables from the hard
drive.
3. Remove the two screws securing the 3 1/2-inch hard drive bracket to the
front of the system unit (see the following figure).
Removing the Bracket Screws
A – Two Drive Bracket Screws