HP TC4400 - Manual (Page 93)

5–10 Maintenance and Service Guide
Removal and Replacement Procedures
7. Remove the four Phillips PM3.0×4.0 screws 1 that secure the
hard drive frame to the hard drive.
8. Lift the frame straight up 2 to remove if from the hard drive.
Removing the Hard Drive Frame
Reverse the above procedure to reassemble and install the
hard drive.