HP dc7800 series Hardware Reference Manual page 29

NOTE: No configuration of the SATA hard drive is necessary; the computer automatically
recognizes it the next time you turn on the computer.
After replacing the hard drive, use the Recovery Disc Set that you created when you initially set up
the computer to restore the operating system, software drivers, and any software applications that
were preinstalled on the computer. When the restore process has completed, reinstall any personal
files that you backed up before replacing the hard drive.
ENWW Upgrading the Hard Drive 23