FUJITSU MCM3064AP - Manual (Page 175)

5.3 Operation of Optical Disk Cartridge
C156-E227-01EN 5-7
(a) Shutter closed
(b) Shutter open
Figure 5.4 Appearance of optical disk cartridge
(3) Write protect tab
(1) Cartridge case
(2) Shutter
(5) Hub
(4) Disk