Figure 1-3. Omnibook XE4100/XE4500— Bottom View 28. Hard disk drive. 31. Reset button. 29. Battery latch. 30. SDRAM door. 32. Port replicator connector*. 33. Mini-PCI door (no user parts inside). * on certain models HP Omnibook XE4100/XE4500 Product Information 1-5