Brother MFC-J825DW Basic User's Manual page 63

IMPORTANT
DO NOT insert a Memory Stick Duo™ into the lower SD slot, this may cause damage to the
machine.
Status LED
When the memory card or USB Flash memory drive is being read or written to, the status LED
blinks.
IMPORTANT
DO NOT unplug the power cord or remove the memory card or USB Flash memory drive from
the media drive (slot) or USB direct interface while the machine is reading or writing to the
memory card or USB Flash memory drive (the status LED is blinking). You will lose your data
or damage the card.
The machine can only read one device at a time.
Printing photos from a memory card or USB Flash memory drive
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