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I have an external HDD I use for backups (rsync during night) and other stuff. On 16.04 it was mounted all the time and I did not have any problems. In 18.04 however, after I lock my session, the disk spins down and gets unmounted.

The mountpoint is /media/username/NameOfDisk and the device is /dev/dm-0

Is there a way to prevent this from happening?

BTW: I tried

sdparm --save --clear=STANDBY /dev/dm-0

and got

unable to access /dev/dm-0, ATA disk?

I also created a cron job that touched a file on the disk every minute, but it still unmounts.

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