How to set up TRIM with Win7 and SSD Drive
I have an Intel X-25M SSD in my developer workstation machine (and it’s quite fast). However, I’ve heard from others that over time SSD performance can degrade due to sub-block level fragmentation that occurs as a result of write combining. Fortunately, newer SSD drives (like mine) support the TRIM command, but of course this only works if your system is sending the command to the drive.
How Do I Know if Windows is Using TRIM for my SSD?
Fortunately (and thanks to Ken), there is a simple command you can execute to determine if windows is sending TRIM commands to your SSD drive.
Run the following command:
fsutil behavior query disabledeletenotify
If the result is 0, then Windows is sending TRIM commands to the device (which obviously needs to have firmware that supports TRIM for this to matter).
Comments
Carl said on 01 Feb 2010 at 1:55 PM
Thanks! bookmarked for future use -- whenever I get around to building that uber-performant silent pc.
Michael K. Campbell said on 01 Feb 2010 at 2:09 PM
Great reference Steve.
And for anyone with SSDs in a RAID, just note however that DisableDeleteNotify will LIKELY still return 0, but you won't be getting the TRIM love/happiness that you need and you'll pull your RAID apart to get it 'cleaned' every once in a while.
Brad Kingsley said on 01 Feb 2010 at 2:23 PM
Has anyone gotten a response other than 0? I've gotten zero on each of my tests. Maybe I'm just lucky and it's running on my Win7 systems by default, or maybe it doesn't report as expected - ?