HP dx2308 - Microtower PC Service & Reference Manual page 60

NOTE:
There are a total of eight extra guide/retainer screws on the front of the chassis behind
the bezel. Four have Unified Standard (US) #6–32 standard threads and for have M3 metric
threads. US screws are used for used for hard drives and have a silver finish. Metric screws are
used for all other drives and have a black finish. Be sure to install the appropriate guide screws
into the drive.
52 Chapter 7 Removal and Replacement Procedures— Microtower (MT) Chassis ENWW