HP Compaq dc7100 MT Hardware Reference Manual page 44

Hardware Upgrades
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5. Connect the power cable 1 and data cable 2 to the hard drive.
Connecting the Power Cable and Data Cable to a SATA Hard Drive
6. Connect the opposite end of the data cable to the appropriate
system board connector.
The replacement hard drive kit includes several data cables. Make
sure to use the cable that is exactly the same as the factory-installed
cable.
If your system has only one SATA hard drive, you must connect the
hard drive to the connector labeled P60 SATA 0 first to avoid any
hard drive performance problems. If you are adding a second hard
drive, connect the data cable to the system board connector labeled
P61 SATA 1.
7. Replace the computer access panel.
8. If you normally lock the Smart Cover Lock, use Computer Setup
to relock the lock and enable the Smart Cover Sensor.
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