HAF Stacker cooling for seldom used HDDs? in Cases Posted June 20, 2014 The difficulty of a temperature based solution is why thought to ask the group... I had looked at controllers but was curious if anyone else found one they liked. I'd want one that turned off the fans rather than just changing the intensity. I haven't come across one like that yet. And the ones I saw had 0-5 sensors so I was deciding the best location to place them to cover the 9 hard drives in each of the 915's. My drives are performance drives, they make the most sense for my usage. The drives are large and I move lots of data around. I don't feel comfortable with 3.5" drives stacked on top of each other without good ventilation. I have seen all kinds of poorly designed cases that put hard drives in cramped, low airflow locations, but I'd rather not design it that way. I might be ok with a single fan if it could move air near the hard drives but with the open nature of the 915's I assume the airflow would be short-circuited. It's too bad that I don't see any cheap/off the shelf ways of having a programmatic interface. With an interface I would easily write a program that turned the fan on when the drives were in use. Thanks for the consideration! -Bill Some other misc background information 1) I build media servers for other people too, so this solution won't be a one time thing 2) While the cost of fans isn't too much (for example in 2009 I paid $.09 per KWH which would make six 3.3 Watt fans cost $15 a year) but I don't pay the electric bill where these are installed and I don't like spending other people's money.