Dell PowerEdge R905 - Manual (Page 125)

Installing System Components
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10 Remove the SAS backplane from the system:
a If you are removing a 2.5-inch drive backplane, press the spring-loaded
blue retention tab towards the front of the system, slide the backplane
upward. See Figure 3-29.
If you are removing a 3.5-inch drive backplane, pull the spring-loaded
blue retention pin away from the front of the backplane, then slide the
backplane upward. See Figure 3-30.
b When the backplane cannot slide upward any farther, pull the
backplane toward the back of the system to remove it from the
retention hooks.
c Lift the board out of the system, being careful to avoid damaging
components on the face of the board.
d Place the SAS backplane face down on a work surface.