HP ProDesk 490 G3 MT - Preventing Electrostatic Damage to Equipment; Personal Grounding Methods and Equipment; Grounding the Work Area

Drive positions
1 9.5mm slim optical drive bay
2 3.5-inch internal hard drive bay
3 2.5-inch internal hard drive bay
4 3.5-inch internal hard drive bay
NOTE: The drive configuration on your computer may be different than the drive configuration shown above.
NOTE: The upper hard drive bay can contain either a 3.5-inch hard drive or a 2.5-inch hard drive, but not both.
To verify the type and size of the storage devices installed in the computer, run Computer Setup.
18 Chapter 2 Hardware upgrades