HP LaserJet 4250 - Manual (Page 259)

5. Open the access door by pulling on the metal tab.
6. Remove the CompactFlash card from its package.
7. Hold the CompactFlash card by its edges and line up the grooves in the side of the card
with the tabs in the CompactFlash card slot.
8. Slide the CompactFlash card into place.
9. Close the access door, press firmly until it snaps into place.
ENWW Installing CompactFlash cards 247