How to check if TRIM is Enabled

Want to find out if TRIM is enabled and working on your SSD? After installing a solid state drive, it’s important to verify that TRIM is active to maintain optimal performance and longevity.

The TRIM command allows your operating system to notify the SSD which data blocks are no longer in use so they can be cleared internally. Unlike traditional hard drives, SSDs do not benefit from defragmentation. Instead, TRIM helps manage garbage collection and keeps read and write speeds fast over time.

How to Check if TRIM is Enabled in Windows

Follow these steps to verify that TRIM is active on your system:

  1. Click Start, type cmd, then right-click Command Prompt and select Run as administrator.
    Run Command Prompt as Administrator in Windows
  2. In the Command Prompt window, type:
    fsutil behavior query DisableDeleteNotify
    Then press Enter.
  3. Check the result:
    • DisableDeleteNotify = 0 - TRIM is enabled
    • DisableDeleteNotify = 1 - TRIM is disabled

    DisableDeleteNotify result showing TRIM enabled

How to Enable TRIM in Windows

If TRIM is disabled (DisableDeleteNotify = 1), you can enable it with the following command:

fsutil behavior set DisableDeleteNotify 0

After running the command, restart your computer and check again to confirm TRIM is now enabled.

Does Your SSD Support TRIM?

Most modern SSDs support TRIM automatically. However, if your drive is older or uses a non-standard interface, TRIM may not function even if Windows reports it as enabled.

  • Check your SSD manufacturer specifications
  • Update your SSD firmware if available
  • Ensure AHCI mode is enabled in BIOS/UEFI

Why TRIM Might Not Be Working

  • External USB SSDs may not support TRIM
  • RAID configurations can disable TRIM support
  • Outdated SSD firmware
  • Incorrect BIOS settings (IDE instead of AHCI)

Is TRIM Still Important?

Yes. While modern SSDs include advanced garbage collection, TRIM is still important for maintaining long-term performance and reducing unnecessary wear on storage cells.

Additional SSD Optimization Tips

  • Keep at least 10 to 20 percent free space on your SSD
  • Avoid traditional disk defragmentation
  • Ensure Windows drive optimization is enabled
  • Keep your SSD firmware up to date
By Lance, Provider of Simple Solutions | 2 min read
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