Adding Parts 81CAUTION: Before you begin any of the procedures in this section,follow the safety instructions listed in "When Working Inside YourComputer" on page 12.HINT: Drives sold by Dellcome with their ownoperating software anddocumentation. After youinstall a drive, refer to thedocumentation that camewith the drive forinstructions on installingand using the drivesoftware.NOTICE: To avoid possibly damaging the drive by electrostatic discharge(ESD), ground yourself by periodically touching an unpainted metal surface onthe back of the computer.Your computer includes a floppy drive and a CD or DVD drive. You can addother devices, such as a Zip drive, a CD-RW drive, or a tape drive.5.25-Inch DevicesCAUTION: Before you begin any of the procedures in this section,follow the safety instructions listed in "When Working Inside YourComputer" on page 12.1 Shut down the computer (see page 20).2 Turn off any attached devices and disconnect them from theirelectrical outlets.NOTICE: To disconnect a network cable, first unplug the cable from yourcomputer and then unplug it from the network wall jack.3 Disconnect the computer power cable from the wall outlet, and thenpress the power button to ground the system board.4 Unpack the drive and prepare it for installation.See the documentation that came with the drive to ensure that thedrive is set up for your computer.HINT: Two sets of railsare attached to the insideof the computer cover.Use the two longer railson 5.25-inch drives.Use the shorter rails for3.5-inch drives. Rails fora second hard drive areattached inside the hard-drive bay.5 Remove the two longer, green plastic rails from the inside of thecomputer cover.These rails are not attached to the computer cover with screws. Toremove the rails, gently ease the rails up and out.6 Attach the rails to the drive using the two screws supplied with thedrive.Ensure that the rail tabs are positioned at the back of the drive.7 Open the computer cover (see page 65).