Compaq 311245-001 Startup And Reference Manual page 77

Drives and Drive Media
8. To insert a hard drive, insert the 2 alignment tabs on the hard
drive cover into the 2 alignment slots on the hard drive bay 1,
then tilt the hard drive assembly downward into the hard drive
bay until it is seated 2.
Inserting an internal hard drive into the hard drive bay
Startup and Reference Guide—Part 2 5–13