Plasmon MOD 910 - Manual (Page 21)

Disk Cartridge Notes
1. Never open the shutter to look at the disk. The shutter is
provided for protection against dust, dirt and other
contaminants.
2. Avoid subjecting the cartridge to sudden shock or impact.
3. When the write protect window is open, the disk is in a read
only mode of operating.
Read write enable Write protect
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User Manual