11InstallationThis installation should be made by qualified service personnel or system installers. CautionsPlaces to avoid• Direct exposure to sunlight or near a source of heat such as a radiator.• Very dirty and dusty places. Places subject to strong vibrations.• Near a transformer, dimmer, video player, radio, or monitor. These may cause humming noises, etc.About mounting• Do not block the ventilation openings or slots in the cover to prevent the appliance from overheating.• Always keep the temperature in the rack within +45 °C (113 °F).• Secure the rear of the appliance to the rack with additional mounting brackets (procured locally), if the rack is subject tovibration. Installing the Hard DiskThere is space for additional hard disks inside and up to eight hard disks including the factory-installed hard disks can beinstalled.The unit is provided with four IDE interfaces, allowing installation of up to eight hard disks.1. Turning off the power.Please check the rear of the unit and confirm that the power switch is turned off, the power cord has been disconnected,and the [OPERATE] indicator is off.2. Remove the top cover.Remove four screws on the side panel and five screws at the rear to remove the top cover (see Fig. 1).3. Remove the hard disk fixing frame.Of the five hard disk fixing frames, the three frames nearest the front panel can accept two hard disks each. The twoframes near the rear panel will accept one hard disk each.If you need to remove a hard disk fixing frame, be careful not to damage the fan connection terminal and the hard diskcable. (Fig. 2)Fig. 2Fig. 1HDD fixingframes