4tb WD Red no longer compatible with synology?

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Even though Synology do not list SMR drives as compatible they will still work with Synology. WD did a terrible thing by changing the existing CMR drives to SMR drives. Because mixing two technologies are not a recommended thing to do. The performance would suffer. But if you have all drives of the same kind then you should not worry much.It is more of a problem for those who need to replace an existing drive in a RAID. I hope this helps.https://nascompares.com/answer/how-to-tell-a-difference-between-dm-smr-and-non-smr-cmr-drives-hdd-compare/