On 04/05/17 15:55, Andreas Klauer wrote:

On Wed, May 03, 2017 at 07:22:58PM -0700, Shaohua Li wrote:

quoted

Unfortunately not all SSD return zero after trim.

For example? I was under the impression that pretty much all of them do.

Pretty much every Samsung except the 840 Pro it seems. Certainly my 830s 
and 850s don't.

Even the ones that don't advertize it returned zero after trim for me.

You got lucky.