I have a 3 - 4 year old 250GB WD hard drive that has shown abnormally high temperature readings ever since I bought it. The temperatures were so much higher than expected that I ended up attributing them to a bad sensor. For example, the other drive I have on the my system at the moment is a WD 640GB and it is currently at 40C. While the 250GB drive is at 62C. Typically, when the system boots up the temperature for that drive will quickly clime to 50C - 58C (today's a bit hotter). These drives are right next to each other in the case so that there is no other source of heat that could affect the temperatures.

All in all I never had any problems with that drive (except for the alarming temp readings) but in a recent S.M.A.R.T data check I noticed some CRC errors. These errors are usually attributed to bad cables bad just to be on the safe side I am planning on retiring this drive soon.

In the early days, when the 250GB drive was my main drive I was quite worried so I bought a hard drive cooler for that drive. It manages to to lower the temperature by about 5C. The problem is that it really makes a lot of noise. What I am interested in knowing is if my assumption that it's more than likely a bad sensor is logical so that I can disconnect the hard drive cooler and get some peace and quiet.


6 Answers 6


if it is the drive i am thinking about, a wd 250gb jb series, then speedfan does give the wrong temp reading, but if it is about 4 years old then i would be very careful of it since i just had the one i was monitoring go with crc errors. right away we swapped to other drives and the drive became unreadable later in the day. be careful and migrate away from that western digital drive if you have critical data on it. if you want the model of the drive i can look it up remotely on one of the old servers and post the model back here.

  • The drive is a js series. Actual model WD2500JS-60MHB1. I am using HD Tune to read the temperature data but it gives the same readings as speedfan.
    – user199421
    Commented Oct 20, 2011 at 16:43
  • yup that is the one that i had to just replace, i had one crc then i had a ton of mdb data files that could not be open, went back to backups that i had from replicated partner when i was doing backups via robocopy, so it was a hot backup type recovery. move on sooner than later to a new drive.
    – dasko
    Commented Oct 21, 2011 at 0:01
  • All drives fail, the only question is when it fails. Backups of all important data is essential.
    – Tim
    Commented Feb 21, 2016 at 21:15

It sounds like this isn't a rack mount server but a tower type of system.

If so, and you don't have high uptime requirements, try removing the "hot" drive from the usual area next to the other hard drive and running it there. For example, if you have something like a small cardboard box it can rest on rather than mounting in the case. This is temporary while you test the thermal issues.

There are two things you can test from this.

  1. Does the temperature run more similar to the other drive now?

  2. Does the drive feel hotter to the hand than the other drive while touching the metal casing?

If the temperature is reduced a great deal, then the problem can be because it was sandwiched next to the other drive. Generally, heat will rise and the top drive will be hotter. Drives will also run cooler when not sandwiched together too closely. I prefer to leave 1 inch of air around if possible.

If the temperature feels the same to the hand, but the probed value is more than 10 degrees difference, maybe the sensor is inaccurate.

  • You know I did touch both hard drives and both temperatures seemed pretty much even or at least there wasn't much of a difference that would justify readings 25 degrees higher.
    – user199421
    Commented Oct 21, 2011 at 22:48

The temperature isn't innacurate by a "large margin", in my opinion. I would say that the reading of ~60 degrees is accurate. While it MAY be possible that the sensor has an offset, I'd say that it's probably just a model that happens to run abnormally hot. Normally, temperatures above 50 deg C aren't good, and coupled with CRC errors and the age of the drive, you'd be best off replacing it (and make sure you have a backup!).


Yes, that is possible.

I've had SSD-drives that are measured as being -20 Celcius. Which was really bad, because ACPI sendt a "power-button"-event to the operating system shortly after it was booted up.


In the morning, when starting a cold computer, the temperature in both drives should be the same( +-1 degree). If the diference is large, then one drive is showing a wrong temperature.


This affected the WD JS/KS/YD/YS disk series manufactured before 1/9/07 (info from 2010 archive of ReadyNAS Community Hardware Compatibility List Hard Disks).

From response of Western Digital Customer Service and Support posted in 2006 on Tom's Hardware forum:

WD2500JS drives have a known issue involving the internal temperature sensors in the drives. (...) The best way to measure Western Digital hard drive temperatures involves using a[n external] temperature sensor (WD Support - Internal Drive: Where to Connect an External Temperature Sensor).

WD2500JS-60MHB5 (manufactured 31 aug 2006) that I have reported temperature of 88 degrees.

PS. Correct link to smartmontools FAQ entry from the question comment: Why is my disk temperature reported by smartd as 150 Celsius?

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