Its presence is indicated by the 'Deterministic read data after TRIM' capability (you can check it using "hdparm -I"). So it's not like you need to blindly trust your SDD.
>Anyways, I believe TRIM just tells them that the blocks are no longer being used. It's not a order to zero out the blocks.
With deterministic zeros one can also use it as a way to quickly erase blocks.
Besides, overwriting something on SDD in most cases would NOT actually overwrite it in the real hardware flash due to load balancing and remapping.
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