202 Adding and Replacing Parts7 Slide the sliding-plate lever to release the shoulder screw and slide thedrive out of the lower 5.25-inch drive bay.8 Set the drive aside in a secure location.Installing an Optional Fourth Hard Drive (Tower Computer)NOTICE: In a tower configuration with multiple optional drives, there can only beone floppy drive or Media Card Reader, which must be installed in the lower3.5-inch drive bay. The third hard drive must occupy the upper 3.5-inch drive bay.The fourth hard drive must occupy the lower 5.25-inch drive bay.1 Follow the procedures in "Before You Begin" on page 143.2 Remove the computer cover (see "Removing the Computer Cover" onpage 145).3 If you are installing a new drive, unpack the drive and prepare it forinstallation.Check the documentation for the drive to verify that it is configured foryour computer.NOTE: Drive-panel inserts may contain screws on the inside. You can attach thescrews to new drives that do not have any screws.4 If you are installing a new drive, remove the drive panel (see "Removing theDrive Panel (Tower Computer)" on page 213) and the drive-panel insert(see "Removing a Drive-Panel Insert" on page 218) from the lower5.25-inch drive bay. Use the screws provided with the new drive to installthe drive into the drive bay.5 Slide the sliding-plate lever and hold it in place as you guide the drive intothe lower 5.25-inch drive bay and gently slide it in until it is securelyseated.
