Hardware Underside Bays and Memory Compartment Underside: Bays and Memory Compartment 1 Battery bay Holds a battery pack. 2 Battery pack release latch Releases a battery pack from the battery bay. 3 Memory compartment Contains 1 memory slot for an optional 128-MB, 256-MB, 512-MB, or 1024-MB memory module. As shipped, the memory slot may be filled with a replaceable memory module or vacant, depending on the notebook model. 4 Hard drive bay Holds the internal hard drive. Startup and Reference Guide—Part 2 2–13