Open an elevated command prompt and type:
fsutil behavior query disabledeletenotify
Result:
disabledeletenotify = 0 (TRIM Enabled)
disabledeletenotify = 1 (TRIM disabled)
(It's on by default with Windows 7 install. You must use a compatible controller (usually Intel) with the default Ms AHCI driver or Intel RST with a single drive in AHCI or RAID mode.
Enable TRIM:
fsutil behavior set disabledeletenotify 0
Disable TRIM:
fsutil behavior set disabledeletenotify 1
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