I’ve lost 3 WD hard drives over the past 6 months. Not sure why, but one concern I have is dust. We live in an apartment building in the city next to a busy street, so I believe we have more dust than normal. Can someone recommend a dust-free enclosure for 2 Drobos (a 2nd gen Drobo, and a Drobo FS).
You should buy a filter paper or just cut some paper from a bag made for vacuum cleaners. Place the paper either in front of the 140mm fan or between the fan and the Drobo. You could vacuum your filter when it become dirty. Replace the filter when it doesn’t look clean enough.
Do not add a filter without adding a fan. The Drobo got poor enough airflow as it is.
A drive should feel pleasantly warm to touch when it got its ideal temperature, 30C to 45C. It is definitely too hot when it is uncomfortable to keep holding your fingers at it, 60C.