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Seagate 4TB 3.5".

$ hdparm -S60 /dev/sda

OK. 5 mins after no access on HDD, it spins down. No problem.

But every 30 mins it wakes up by itself without any event, and goes to bed immediately. I have to wake up in the middle of night because of its spinning up sound.

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  • What is your operating system? What services are running, and what is the output of tail /var/log/messages ?
    – Nils
    Dec 11, 2016 at 14:54
  • Do you have a swap partition on that HDD?
    – dirkt
    Dec 11, 2016 at 20:22
  • @Nils, Armbian. Default services. /var/log/messages is full of rsyslog retry msgs.
    – user58029
    Dec 12, 2016 at 0:04
  • @dirkt, Oops. It's the external HDD NTFS with truecrypted big file in it mounted. No SWAP.
    – user58029
    Dec 12, 2016 at 0:05
  • Is it possible that either the NTFS kernel driver or truecrypt accesses the disk regularly for some reason? What happens if you disable truecrypt, and just mount the NTFS?
    – dirkt
    Dec 12, 2016 at 8:03

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