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Running Ubuntu desktop 14.04, and having problems powering down an external USB 3TB drive.

hdparm -y /dev/disk/by-uuid/736gyh3juhg64 doesnt work because of

G_IO: bad/missing sense data, sb[]: error

I did manage to find a workaround using sudo sg_start --stop /dev/sdc and this seemed to work for a while, but today I noticed that the drive immediately mounted & powered back up again immediately after being shut down.

I attempted to power off the drive using the gnome-disk-utility, and the same thing happens: the drive immediately powers back on again after being shut down. I turned off automount as well and have nosuid,nodev,nofail,x-gvfs-show,noauto set

I attemted to disable automounting editing org.gnome.desktop.media-handling/automount with dconf editor but this did not solve the problem

I am also not running any apps that access the drive while shutting it down.

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I'm using Seagate external HDD drive and I remove my HDD from Ubuntu in two steps:

1. In file manager pressing the small **eject** icon.
2. Then right clicking and **safely remove** the external HDD.

I have not checked for others as I've only Seagate HDD so not sure whether it will work on others but you can give it a try

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