Canon PIXMA MX870 - Manual (Page 470)

Some USB flash drives with security settings may not be used.
1.
Insert the USB flash drive into the Direct Print Port.
Make sure that the USB flash drive is correctly oriented before inserting it straightforward into
the Direct Print Port.
Removing the USB Flash Drive
1. Make sure that the machine is not writing data to the USB flash drive.
Check if the writing operation is complete on the LCD.
Important
Do not remove the USB flash drive or turn off the power while the machine is operating.
Note
If you use the USB flash drive with the access lamp, refer to the instruction manual
supplied with the USB flash drive to check if the writing operation is complete on the
USB flash drive.
2.
Remove the USB flash drive.
Hold the USB flash drive and remove it from the machine straightforward.
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