Lift off the metal base, revealing the hard drive.

Disconnect the ATA hard drive cable from the right side of the logic board. Try to pull straight up so you don't bend the pins on the hard drive.

The hard drive is mounted on the baseplate of the unit. It is a 40 GB 2.5" Fujitsu ATA drive (NOT an SATA drive). You can replace this drive with a standard ATA laptop drive if you want to upgrade it.