Question regarding the FAN used by WD My Cloud EX2

Thanks for the reply. Actually I just realized the group is EX2, but I have PR4100.
My main HHDs are mainly idle, so mostly very cold. I am using SSD for fast file access for my applications - nextcloud, plex, etc. But the problem is CPU thermal settings. Those numbers don’t look right to me.
I test with high CPU load and while CPU temp constantly inreases, without fan increment. The thing I’m not sure is, is it a bug or intentionally implemented that way?
Can you check what do you have on CPU settings? Mine is:

<step name="start"             action="compare_temperature"    source="dts" index="*" comparison="less_than"    value="1.0"  interval="10" goto="set_cpu_extreme" next="check_cpu_danger" />
<step name="check_cpu_danger"  action="compare_temperature"    source="dts" index="*" comparison="less_than"    value="3.0" interval="10" goto="set_cpu_danger"  next="check_cpu_warm" />
<step name="check_cpu_warm"    action="compare_temperature"    source="dts" index="*" comparison="less_than"    value="10.0" interval="10" goto="set_cpu_warm"    next="check_cpu_content" />
<step name="check_cpu_content" action="compare_temperature"    source="dts" index="*" comparison="less_than"    value="17.0" interval="10" goto="set_cpu_content" next="check_cpu_under" />
<step name="check_cpu_under"   action="compare_temperature"    source="dts" index="*" comparison="greater_than" value="89.0" interval="10" goto="set_cpu_under"   next="check_cpu_cool" />
<step name="check_cpu_cool"    action="compare_temperature"    source="dts" index="*" comparison="greater_than" value="16.0" interval="10" goto="set_cpu_cool"    next="check_mem_extreme" />

Well I have read a lot on various blogs but couldn’t find a satisfactory solution. I live in QLD Australia where currently the outside temp is 35 deg C. The drive, being used in Span Mode, shut down on me recently, and when I looked at the dashboard it said it was in the mid 70 deg C. so I built a 30 mm high wooden box with 2 rectangular and one round hole in it and mounted my 2 NAS drives onto the box over the rectangular holes so the drives weight causes it to seal and over the round hole which is in the middle I mounted a 150mm computer fan running at 1000 rpm. The noise is extremely low but it managers to keep the temperatures of my EX2 NAS drive under 40 deg. My older LIVEDUO has never had a temperature excess problem.

I have the same problem with my EX2 is there any solution for it ?

This fan is only $11 on Amazon and works so well, that the system fan never turns on at all.

It has 3 speeds too and is so much quieter than the internal fan.

Perhaps this helps.

Thanks to those who recommended the Infinity fan. I recently bought 2 WD 8tb red drives for the ex2. Yes, they work, but tend to run hotter at about 56/57 degrees with no load. I then also recently installed plex which requires your nas to not sleep and so the fans were running non stop and tend to be quite noisy where I had the nas. This fan is extremely quiet and brought down my temps to 40 allowing the internal fan to not run anymore! Success!


Just frustrates the poop out of me that WD can’t fix the fan controls. How easy it would be!
Bought some machine screws and nuts and mounted the infinity fan. Hokey
but works.

not sure if you’re monitoring this thread … but i decided to implement your method, utilizing my the correct file “BVBZ…” for my application (EX2 Ultra), the only thing i did not do verbatim to your steps is that I created a new folder in Public and placed the 2 files inside that.
also using the same temperatures you are in your example.

my EX2 only has 1 drive installed.

getting the drive up to around 42-44C, the fan still registers 0 RPM in the diagnostics panel.
not sure if the temperatures that trigger the fan are some other temperature than the drive’s; which is displayed in diagnostics panel ?

I confirmed that the fan indeed works, by using the fan_control command from the earlier post.

i am wondering if something might have changed since 2017, where there may be other settings in another file that control when the fan spins up, or the procedure for doing this is now different than it was back then ?


i saw fan activity in the diagnostic panel when i tried loading the drive with file operations for about an hour (streaming 7-8 videos, doing backups, etc.).

does not look like the info displayed in the diagnostic panel updates too frequently … so i didn’t see an accurate picture of how the fan was running.

since i keep the unit inside a furniture enclosure, was not apparent when it did spin up.

conclusion is that fan is coming on sooner or at least it is coming on around the 43-44C mark for drive temp.

thanks for all the detailed info on how to do this !

For thos here struggling with excessive fan noise and high NAS temps in their EX2 or EX2 Ultra, I added a simple 4 inch fan from Amazon ($10) that is USB powered from the back of the NAS and it DRASTICALLY helped to reduce the internal heat. My internal NAS fan now doesnt turn on after 30 nins whne the NAS used to reach 60 deg C !!! and never come down and the NAS fan made it sound like a jet was flying by!!!
EVen with the USB fan on medium speed the NAS fan doesnt turn on unless I switch the external USB fan off. Its a game changed. The NAS fan would kick on at about 55 deg C which to me is way too late.
I recently upgraded the hDDs in my MyCloud EX2 Ultra from the stock 2 TB drives to two 10 TB drives but I didnt realize the change would mean the whole NAS would run MUCH hotter and cause the fan to be on constantly and NOISY (whereas the stock drives were very quiet and fan barely needed to come on under normal loads)
You can use any USB fan but the one I got and is working great for me is the one on Amazon. Search for
" AC Infinity MULTIFAN S1, Quiet 80mm USB Fan for Receiver DVR Playstation Xbox Computer Cabinet Cooling "

Hope this helps

I’ve been struggling with high temps in my EX2 Ultra as well. I’ve bought it about three years ago, replaced the original 2Tb 5400RPM disks with 8Tb 7200RPM drives and everything ran fine for a long time. A few months ago I started getting temp alerts, with the hard drives reaching 60C/140F. At least twice the unit has shutdown. In one of them, I’ve lost my iSCSI targets. Had to restore the files. As kinglerxt, I’ve placed a small fan on top of the NAS. It has helped to reduce the temperature, but only for some time. And I started getting the alert emails again. As a last resort, I was about to remove the plastic cover to allow a better air flow. And then I realized… This model is poorly designed. The fan is installed vertically at the front of the NAS, right behind the plastic cover. But the only open parts are top and bottom. So the only possible air flow is from bottom to top, behind the fan !!! Just please don’t ask me why the fan was placed vertically. It doesn’t make any sense to me. And because the rubber “feet” broke free, it was seating directly on the table. So there could be no air flow at all. I then glued the rubber feet again, and placed it in a way the bottom center is about an inch from the table. And, believe it or not, problem solved. Disks now run at 50C-52C, even with internal fan at 6K RPM … If you’re dealing with temp issues, try to “raise” your EX2 so the bottom center gets about an inch from the surface, allowing a better air flow. If it’s not enough, try also placing an USB fan on top of the NAS. Might work with the fan under the NAS as well. Hope it helps.

Hi Clarkson,
Did you try the program with the new Cloud OS 5?

Same question about OS5.
But in the end got tired of waiting, seeing my 2 x drives in the red at 55C constantly even when idle… So bought a £10.00 8cm Infinity fan, like most of us here, works a treat: dropped 16 degrees in 10 minutes…

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Search Amazon - “AC Infinity MULTIFAN S1, Quiet 80mm USB Fan, UL-Certified for Receiver DVR Playstation Xbox Computer Cabinet Cooling”

Yup thats what I did back in July. never have any issues now and internal fans never need to come on. Temps used to be scary and LOUD fan spinning all the time.Just hook it up to a USB port on the back of the MyCloud. Problem solved and will help your drives last longer. Whats cool (no pun intended) is that you can change the fan speed so in the summer put it to max to keep cooloer and in the winter when its colder inside you can put it on medium.
If I try on low then internal fans still kick in.

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I bought my MyCloud EX2 in 2018 and one of the drives died recently. My experience with hard drives go back a long way, as I’ve been in IT since around 2007 and I’ve hardly ever seen one die that was less than 7 or 8 years old. And by “bad” I mean that the S.M.A.R.T output said Bad. Mine came with 2 2TB WD Red drives. Since I wanted some more space anyway I went ahead and purchased 2 4 TB drives and am in the process of copying everything back over right now.

Looking into possible causes though, my only thought was temperature, since it has been in the same location undisturbed for 3 years. Both drives seem to stay around 43-45 C which may be acceptable to WD but is not to me. I’ve gone ahead and purchased a fan to put on top, but it’s just kind of surprising to me that this thread goes back to 2014 and there’s still no way to adjust the thermal limits.

I’ve played around with the fan_control command but there’s something else monitoring the temp and lowers the fan speed after using it, so I would have to look around and find what it doing that. I found some xml files in /etc/wd that monitor CPU but not sure if those do the HD temps too, I’ll check a bit later.

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I also own the EX2 Ultra and while it was still under warranty an RMA was arranged for it after what seemed constantly high fan speeds but still high heat and other issues with its operation. not even a year after my warranty expired, my EX2 Ultra showed a fan malfunction warning.

So it would seem that a whole lot of people are experiencing fan issues with the EX2 Ultra’s fan and /or fan control software and WD has failed to take any measures to fix what would seem to be a potentially catastrophic design flaw in this product after years of customer complaints. In some cases, users of this product have given up and simply purchased a third party fan and installed it atop their NAS.

Would you say the above is a fair statement?

If so then you will agree that the design of the WD EX2 Ultra NAS does not conform to a reasonable expectation of product performance.

I have extensive links and screenshots of similar threads to the above all over the web. WD can not be unaware of this issue.

If this company refuses to fix this manufacturer defect then I think there are clear grounds for a class action lawsuit against WD.

Meh, the only people who get anything out of a class action lawsuit are the lawyers. We (who get pennies) end up losing even more, as the manufacturer increases prices to pay the lawyers for their lion’s share of the settlement!

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I know its like 6 years later LOL, but I’ve had my ex2 ultra for about a year now, and up until lately I noticed the fan was REALLY loud. I get up at 4:30am and the whole apartment is quiet except for the noise of the fan . I never noticed it before , so to counter this I set a power schedule to turn off the unit from like 11pm-8am, since I never use the NAS between those hours. But then during the day I would start to notice the noise more often and it was bothering me. I finally bumped into this thread , saw your post and ordered the fan. The result is INSANSE!!! I have 2 WD RED PRO drives…and while doing NOTHING…the temps were in the 50c’s and the fan was running 6-8,000 rpm!! ALL THE TIME!..but now? with the Infinity 80mm fan on top…drive 1 is 32c and drive 2 is 38c…and the internal fan is 0 RPM. NO NOISE, plus the Ininity fan is super quiet even on HIGH. So in short… THANK YOU!!! you saved my sanity!!! ( 6 years later!! lol)

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This Fan issue is just silly, especially for now in 2021!
The firmware should NOT decide for us what temperature to turn the fan on.
Not all drives are the same and some like to run cool.

So an option to set the temperature LOWER than the default (but not higher) would be a good optoin.

However, I don’t even know if the fan is even working on this new box I just bought.
When I run System Diags, for the FAN it shows a red exclamation point!
In the Logs, however, the fan is not mentioned. So perhaps that’s a good thing,
At any rate, I put a little 2" fan on top, which is very quiet and throws enough air to keep the unit cool all the time.

I wish that Western Digital would produce a much more stable and NEW device.
Not keep selling a (what is it now? 10 years old or something??) device.

I used a usb fan from eBay plugged in and left on bottom has got a speed control h medium low used another on side of router everything is cool as cucumber thanks a lot for the info

I cannot believe that the year is 2022 and we are installing fans on top of WD HDD’s to cool them off. :roll_eyes: This, after a discussion in a thread that was started in 2014! Just to think that WD could not add a more powerful internal fan at a cost of a couple of bucks to the BOM. Truly a pathetic company!

My drives run at 28C (down almost 30 degrees C!) after installing the USB fan in the most efficient way: take off the grill, tape to the top of the box with two strips of Gorilla tape, blowing air IN.

P. S. Fan used: