Power Supply Requirements; Figure 3.8 Mcm3130Ap Current Waveform (+5 Vdc) - Fujitsu MCM3064AP Product Manual

(6) External light source
Mount the optical disk drive away from strong light sources (e.g., camera flash).
(7) System ground (handling of SG and FG)
The optical disk drive must be grounded to the signal ground (SG) of the power
supply of the user's system. This SG line must be supplied with the system as well
as the power line.

3.3 Power Supply Requirements

(1) Allowable input voltage and current
The DC power supply input voltage must satisfy the requirements described in
Section 2.1.3, "Environmental and power requirements" when measured at the
power supply connector pin (receiving end) of the optical disk drive (For other
requirements, see items (4) and (5) below).
(2) Current waveform (reference)
Figure 3.8 shows the current waveform while a disk is inserted.

Figure 3.8 MCM3130AP current waveform (+5 VDC)

C156-E227-01EN
The optical disk drive can be mounted in a 120 mm (5 inch) device
bay of the PC chassis using either a metal frame or a plastic
(nonconductive material) frame.
If a plastic frame is used, the personal computer's FG and the optical
disk drive's FG are not shorted. Consequently, the static electricity
tolerance is inferior to that realized when a metal frame is used.
Fujitsu recommends using a metal frame. In particular, a metal
frame must be used especially when high static electricity tolerance
is required.
3.3 Power Supply Requirements
3-13