Canon PIXMA MP560 - Manual (Page 785)

Set to [Not writable from PC]. from LAN PC.
You cannot print from the memory card or save the scanned
data to the memory card when the Card Slot is set to
Writable from USB PC or Writable from LAN PC. After writing
on the memory card, set to Not writable from PC again.
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Page 785 of 949 pages An Error Message Is Displayed on the LCD