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WD RED 2TB do not sync with older WD Green 2TB on RNDU 2120
I have a RNDU 2120 (ReadyNAS Ultra 2) with 2x2TB. It came populated with 2x2TB WD green HDD (WDC WD20EARS-00MVWB0) Firmware RAIDiator 4.2.31 and 1024 MB memory After some years the hard disk drive No 2 failed and I bought a replacement drive. I bought a new 2TB HDD and I choose a WD RED WD20EFRX-68EUZN0 as they are designed to better fit the use on a NAS and they are listed in Netgear's hard drive compatible units for my device. I started the NAS and after letting it go up and finish the booting, then I inserted the new drive in. I received messages of a new hard drive detected and another about the beginning of the syncronization. After some minutes in the web interface health tab, the old (original WD Green) drive appears as "dead" (yellow status) and the new one (new WD Red) appears as "Spare" (green status with a "+" over it). If I restart the NAS after putting only the "old" drive alone in the slot 1 it goes up and works normal (obviously without redundancy) and the drive is not "dead". If I restart the NAS after extracting the "old" drive on slot 1 and putting only the "new" drive alone in the slot 2 it says the drive in slot 2 is ok (in the Raidair health tab) but there is no response whatsoever (the NAS responds through web interface but is not possible retreive data from the disk). Is any parameter or setting that have to be modified or changed? Is an incompatibility between the two tipes of HHDs (Green vs Red)? I greatly appreciate any info regarding my problem. Thank you in advance.