This step is required only for a PCI board of the full-height/full-length type.
7.
Before installing a PCI board of the full-height/full-length type, remove the retainer
from the PCI board, and then unlock and open the card retainer clip on the other side of
the guide rail.
Retainer
Board retainer
clip
Hole
Hook
Lock tab
Upgrading Your NEC Storage 165