Canon PIXMA MP450 User Manual page 53

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Use [ ] or [ ] to select <Read-only mode> or <Read/write mode>, then press
[OK].
Read-only mode:
Read/write mode:
Note
Important
Note
Chapter 4
The Card Slot is used only for reading. Be sure to select this mode
when printing photos from a memory card.
The Card Slot is used as the memory card drive of the computer.
Photo data can be written into the memory card.
Be sure to select <Read-only mode> when printing photos.
Windows 2000, when the write protection is enabled on the machine: If
the computer does not detect that the write protection is enabled, a
delayed write-error might occur and data could be corrupted when
attempting to copy data to a memory card.
You cannot write to memory cards when the machine is in Memory
Card mode.
To change the write protection setting while a card is inserted in the Card
Slot, unplug the USB cable before changing the setting, then plug it back
in afterwards. The new setting is not applied unless you plug the USB
cable back in.
Reading From And Writing To A Memory Card
51