I have come to appreciate the Torx screws that HP uses. Years ago, I disliked them, as they were not a standard philips head screw. Now I like the T15 and other Torx sizes that HP often uses.

Pictured, HP included extra T15 screws in the HP Compaq Elite 8000 desktop computer so it would be easy to add more 3.5 inch SATA drives.