I remove any media from my computers when I send to a repair shop. If any media fails, it should be destroyed. If you ever sells storage media, dd if=/dev/zero it; also consider that it may not be enough with some wear leveling SSD's.

A few years ago, someone bought an used harddisk and got some private information of Brazil's then first lady Marcela Temer[0] and tried to blackmail her. He was later caught and imprisoned, but not everybody has the same luck.

[0] http://g1.globo.com/tecnologia/noticia/2016/10/hd-comprado-h...