145If a hard disk drive failure occurs in the RAID 5 or RAID 6 mode, the error display will appear as shown in the following table.In the RAID 5 mode, it is possible to read data on the other hard disk drives and recover data even when a single hard disk drivebecomes faulty (1 down).In the RAID 6 mode, it is possible to read data on the other hard disk drives and recover data even when 2 hard disk drivesbecome faulty (2 down).When the hard disk drive becomes faulty (down), replace it immediately.Refer to the operating instructions of the extension unit.* Contact your dealer about replacement of HDD units.Important:• In the RAID 5 mode:If 2 or more hard disk drives become faulty (2 down) or when another hard disk drive becomes faulty during the data recov-ery, it is impossible to recover data.• In the RAID 6 mode:If 3 or more hard disk drives become faulty (3 down) or when another hard disk drive becomes faulty during the data recov-ery, it is impossible to recover data.Source At a hard disk drive error (failure) In the process of the recoveryRecorder/Extension unitMonitor 2(recorder)LCD (extensionunit)RAID 1 DOWN: [1down]RAID 2 DOWN: [2down]RAID 3 DOWN (only in the RAID 6 mode): [3down]HDD access indi-catorsLights red: The respective hard disk drive is faulty(which can be recovered by replacing the harddisk drive)• In the RAID 5 mode, it indicates that therespective hard disk drive is the first faultydrive.• In the RAID 6 mode, it indicates that therespective hard disk drives are the first andsecond faulty drive.Blinks red: The respective hard disk drive is faulty(which cannot be recovered even by replacingthe hard disk drive).• In the RAID 5 mode, it indicates that therespective hard disk drive is the second faultydrive.• In the RAID 6 mode, it indicates that therespective hard disk drive is the third faultydrive.Lights red and orange alternate-ly:The respective hard disk drive inthe RAID 5/RAID 6 mode isbeing recovered.Recorder [Error log](Refer to OperatingInstructions (PDF)for further informa-tion.)RAID 1 DOWN:Recorder: MAIN RAIDm 1 DOWNExtension unit: EXTu RAIDm 1 DOWNRAID 2 DOWN:Recorder: MAIN RAIDm 2 DOWNExtension unit: EXTu RAIDm 2 DOWNRAID 3 DOWN:Recorder: MAIN RAID6 3DOWNExtension unit: EXTu RAID6 3DOWNm: Operational modeu: Unit numberRAID recovery failure:Recorder: MAIN RAIDmRECOVERY FAILUREExtension unit: EXTu RAIDmRECOVERY FAILUREm: Operational modeu: Unit numberError recovery of the hard disk drive (when operating in the RAIDmode)
