A:AnswerYes they work in Synology NAS models. The literature, or documentation, recommends WD Reds. I have the DS1515+ model. I bought these HDDs back in 2015 and are still running today (24x7)! I maxed the DS1515+ out with 5 - 6TB WD Reds.
A:AnswerHi zashzidane,
Thanks for showing your interest in WD Red internal drive. Please know this internal hard drive is SMR.
For more information you can refer to the link motioned below.
https://blog.westerndigital.com/wd-red-nas-drives/
Also you can refer to the given link.
“What are the currently shipping SMR Drives”
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A:AnswerNo. The sticker says WD Reds. These HDDs are rated to spin slower at 5400 rpm vs the 7200 rpm. They were designed for 24x7 operations where it's more energy efficient and quieter.