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[Entry]
"To my knowledge, currently there's no simple method, that would cover to all possible cases. Still, in most practical cases, it should be enough to check the following:
As mentioned here fsutil behavior query disabledeletenotify should be 0, otherwise TRIM is disabled in your OS.
Still, this does not mean that OS recognizes your SSD.
If OS recognises your SSD drive, Windows7 should remove it from the defragmentation schedule, (Win8 and Win10 explicitly show ""Media type=SSD"" in their ""Defragment and Optimize Drives"" tool). If this part is OK, this means that your OS do recognize your SSD. And do send TRIM commands.
Still, this does not mean that SSD receives them.
Next, check word 169, bit0 in your drive information. This could be done, for example, using Intel SSD toolbox or hdsentinel tool (trial version is enough). Probably, there are more tools to do that. This bit should be ""1"" if your SSD supports TRIM. (Most modern SSDs do support it.)
Still, this does not mean that the TRIM commands, sent by your OS are properly passed to your SSD, e.g. your RAID controller might not pass them properly.
(Actually, it’s OK to start from this point.) There are few experimental methods to see the evidence, that TRIM is actually working. The most simple & automated way is to use the TrimCheck tool. Sidenote: disk compression, disk encryption, and write-cache buffer flushing should be off. However, there’s still one more caveat here – the DRAT / DZAT features. Too check, if your SSD support DZAT, take a look at word 69, bit14 & bit5 (once again, the “Intel SSD toolbox” should be able to show them, in most cases).
If both DRAT / DZAT bits are ""1"" – you’re lucky - the tool should give you ""TRIM is working"" almost immediately (if it’s actually working). Still, you might need to reboot your PC, and/or launch the ""disk optimization"" (if you're using Windows 8/10).
Otherwise, things got more difficult. The tool may give you CONCLUSION: TRIM appears to be NOT WORKING (or has not kicked in yet) for a few weeks. And then Data is neither unchanged nor empty <...> CONCLUSION: INDETERMINATE, but this does not actually mean that your TRIM is not functioning. On the other hand, there's still a chance, that you would get CONCLUSION: TRIM appears to be WORKING! one day. Try leaving your PC idle overnight (as well as rebooting and launching the ""disk optimization""), to let SSD's built-in garbage collector do his work. If TrimCheck shows TRIM appears to be WORKING!, this almost certainly means just that (unless some ridiculous 3rd party tool was intentionally writing zeros here and there, and, placed zeros above the test data as well). For those who interested, some technical details (as far as I understand them) are here.
The developer of the hdsentinel tool, claims that his tool uses a different approach, based on DEVICE_TRIM_DESCRIPTOR. And that this method alone should do the job. And that it won't even give a ""false positive"" if RAID controller is not passing TRIM commands correctly."
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