Major Operating Controls and Their Functions11(1) HDD unitHDD in special canisterThe HDDs can be added and replaced by using the frontpanel of the network disk recorder. Refer to page 22 fordetails. Contact your dealer for information on purchasingand replacing HDDs.(2) HDD status indicator [STS]Shows the operating status of the HDDs.(3) HDD access indicator [A/F]Indicates the access status and problems with the HDD.When errors occur on an HDD in RAID5/RAID6 mode, theindicator lights or blinks red.(4) HDD bay slotsUp to 9 HDD units can be installed.Note:• Limiting factors for the RAID5/RAID6 mode(5) Removal knobUsed when replacing the HDD units.Inside the Front Cover(1)(5)(2) (3) (4)Lights green : HDD power [On](Formatted)Blinks green : HDD for playback only(only for playback, recording notpossible)Blinks orange : Formatting HDDLights red : HDD format failedOff : HDD power [Off]HDD is not connected or notrecognized.Blinks green : Accessing HDDOff : Not accessing HDDLights red : Errors have occurred on HDD(Data can be recovered by replacingHDD)• When in RAID5 mode, the first HDDhas errors• When using RAID6, the first twoHDDs have errorsBlinks red : Errors have occurred on HDD(Data cannot be recovered even ifHDD is replaced)• When in RAID5 mode, the secondHDD has errors• When in RAID6 mode, the third HDDhas errorsLights orange andred(Alternately): Recovering data from drive in RAID5/RAID6 mode.(This indicator looks orange duringhigh-speed processing.)RAID5 mode : The RAID5 mode can be used whenmore than three HDDs are installed.RAID6 mode : The RAID6 mode can be used whenmore than four HDDs are installed.