HP TC4400 - Manual (Page 92)

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