Comment 112 for bug 1067876

It seems that problem is fixed with the newest version udisks2 2.1.3-1 in Trusty.
From NEWS file:
      Send SCSI START STOP UNIT when powering down a drive (see this commit - http://cgit.freedesktop.org/udisks/commit/?id=fcdd8f48b6ac9b1b6da82fdf5f59230fc2ea6feb)
      udisksctl: add power-off verb to power off drives (see this commit - http://cgit.freedesktop.org/udisks/commit/?id=a54c2fa14c522487a78828d4a9dfd89f916a3576)

It spins down my USB-HDD with safely remove. It's great.

Please note:
   * with modern version of udisks2 "Safely remove drive" in Nautilus and "Safely remove parent drive" in Unity options are available only for USB-HDDs,
   * for USB-flashes there is only Eject option and it is normal.