HP Compaq nc6400 Maintenance And Service Manual page 105

6. Loosen the Phillips PM2.5×13.0 spring-loaded hard drive
retention screw 1.
7. Grasp the mylar tab 2 on the hard drive and slide the hard
drive 3 to the left to disconnect it from the system board.
8. Remove the hard drive 4 from the hard drive bay.
Removing the Hard Drive
Maintenance and Service Guide
Removal and Replacement Procedures
5–9