Dell Alienware M17x R3 (Early 2011) - Manual (Page 80)

CHAPTER 4: INSTALLING AND REPLACING COMPONENTS
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Upgrading or Replacing the Hard Drive(s)
Your laptop is equipped with two hard drive sockets.
Removing the Hard Drive(s)
1. Follow the instructions in “Before You Begin” on page 68.
2. Remove the battery pack (see “Replacing the Battery Pack” on page 72).
3. Remove the two screws that secure the compartment door to the computer base.
4. Slide and lift the compartment door away from the computer.