I have external HDD connected to raspberry PI. I wont to set the spindown time to 5 minutes. When I use sudo hdparm -S 60 /dev/sda it works fine. Of course, I set up APM before to 127 by sudo hdparm -B 127 /dev/sda. I wont this configuration to apply after reboot of raspberry PI so I add to /etc/hdaprm.conf this lines:

/dev/sda { apm = 127 spindown_time = 60 }

After reboot, my disk have APM set to 127 but spindown time is not 5 minutes. When I tryed to reach my HDD and, it will spin down in 2 or 3 sec. I dont konw how to solve this issue. Can anybody help me and explain me why this happend?

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  • Does the same thing happen when you set the time via the command? – goldilocks Oct 27 '16 at 20:10
  • Well, if set it via command line, it take longer to get to spindown but it still to short. I set hdparm -S 60 , it should be 60*5 = 5 minutes. It take only aproximatelly 6-8 sec. If I set spindown_time to 60 in hdaprm.conf, it take only 1 - 2 sec. Do you have any idea where could be problem? Do you need output from hdparam -I ? – dorinand Oct 27 '16 at 20:25
  • No, I don't know much about it. It's always worked for me, including on Pis, but really that only amounts to a handful of disks. I have heard it does not work properly with everything, you could try searching online for hdparm WhateverBrand Model to see if anyone else has had the same problem. – goldilocks Oct 27 '16 at 20:28
  • I tryed it but I did not find anything about my model (ADATA HD710 1T). I also try to check datasheet, but on their web is just 2 pages of information about colour and other not important information. It was not usefull. – dorinand Oct 27 '16 at 20:34

I had the same problem and I found that tlp service was the cause. I did a "apt purge tlp" and my disks stopped spinning down in seconds.

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