Brother HL-7050N - Manual (Page 139)

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HL7050_US_UG_FM5.5
Installing the CompactFlash card
Follow these steps to install or remove a card:
1 Turn off the printer power switch, and then unplug the printer.
2 Insert a CompactFlash card into the slot with the label facing to
the left.
Make sure you put it in properly.
Figure 4-9
Before you remove the card, turn the power switch OFF, and
then unplug the printer. To remove the card, pull it out of the
printer.