Control Data Corporation CDC 790ICEM Owner's Manual page 56

19. Remember to open the write-protect slot after removing the
destination"disks from the drive. with the write-protect
slot open, the workstation cannot accidentally write
unwanted data onto the disk.
20. When you are through copyi ng disks, restor"e the dip swi tches
to the normal operating position as shown, close and relatch
the pedestal door.
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