8 Installing and Replacing Other Components100 Nokia 500s Installation Guidebefore you handle the components or open the appliance. If you donot have a grounding wrist strap, make sure you are properlygrounded before you touch any electronic component.Replacing a Hard Disk driveThe Nokia 500s appliance supports up to two hard disk drives with the diskmirroring feature in the Nokia IPSO operating system. If the appliance hasonly one hard disk drive installed, it is in the top slot (slot A). You can add asecond hard disk drive into the bottom slot (slot B) or replace the hard diskdrive in slot A.This section describes how to remove and replace a failed hard disk drive,and how to add an optional second hard disk drive to implement the disk-mirroring feature.Figure 20 shows the location of the hard disk drives on the front of the 500sappliance.Figure 20 Location of Hard Disk DrivesDisk MirroringThe Nokia disk-mirroring feature provides fault tolerance by letting the Nokia500s appliance continue working in the event of a disk failure. You can createmirror sets that consist of a source hard disk drive (which holds the active00478500sHard disk drive AHard disk drive B
