When I updated to SIERRA, I "lost" the option of SECURE ERASE. That is to say:
1. neither with the tab(s) that use to appear when a window was opened to view TRASH contents,
2. nor using the FINDER's "drop down" menu.
Since I had not changed the HD which came with the 2011 MBPro, there was no intuitive action on Sierra's part to recognize that the machine did not have a SSD or Fusion Drive - but removed the Secure Delete option for Trash anyway even though the "old" (original) HD was still in place.
