A quick Googling shows it exists only in high-end SSDs, but the information is from 2013.<p>Just anecdotally, my Nexus 9 does not even have the fstrim command anymore, nor do I see any discard options in the fstab. My Nexus 7 2012 had lots of interest about fstrim improving performance, but not my Nexus 9. I assumed the TRIM issue had disappeared.