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How can I make sure TRIM is working after I install a new SSD on a Windows 7 PC that came with a HDD (will be reinstalling Windows 7)?
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1. Open a command prompt window. Run as administrator.
2. Enter this command: fsutil behavior query DisableDeleteNotify
3. If you get DisableDeleteNotify=1, TRIM is not working. If you get DisableDeleteNotify=0, TRIM is running.