I have an old Synology DS209 running DSM 4.2-3256 and have 2 hard disks installed (raid 1) I have read something similar on How can I verify the health of hard disks using a Synology NAS?
And have searched the Synology knowledge base, but could not find a thing.
We have two Western Digital WD10EADS-00M2B0 and I got a message about the 2nd disk smart error. Disk 2 is also 4 degrees Celsius warmer than the 1st disk. When I run a fast or extended smart check on the second disk, it stops at 90%. The first disk completes fine.
I have compared the stats for disc 1 with 2 and am wondering if there really is a problem? I think the multi_zone_error_rate shows there is, doesn't it? according to https://forum.synology.com/enu/viewtopic.php?t=81364 it shows that the mechanical state of our disk is bad. Which is confirmed at WikiPedia.
So why does Synology keeps showing status OK when smart does not complete?
Can someone confirm that I have to replace the disk?