Win 10 / 11 · Maintenance

Run drive optimization the safe way

Defragmenting an SSD is actively harmful; skipping it on an HDD leaves speed on the table. Windows has one tool that does both correctly.

  • Difficulty Easy
  • Estimated time 5 min
  • Platform Win 10 / 11
  • Last updated
Run drive optimization the safe way — schematic diagram

Before you start

Low risk. This change is reversible — you can return to the previous state without professional help or data loss.

Steps

  1. Search 'Defragment and optimize drives' (or win+r → dfrgui) — it lists every drive with its type
  2. HDDs: click Optimize to defrag; SSDs: the same button runs TRIM instead, which is what they actually need
  3. Click 'Change settings' → enable 'Optimize on a schedule' (weekly for HDDs, monthly for SSDs) and let Windows do it overnight
  4. Keep 10–20% of your main drive free — a full disk slows everything down, including the pagefile

How to verify the fix

The optimization schedule runs overnight without errors, and each drive gets its correct operation (defrag for HDDs, TRIM for SSDs).

If this didn't fix it

Optimization fails or the drive is still slow — check free space (keep 10–20% free) and run a disk health check.

Next stop: the related fixes below, or start a guided diagnosis.

Related fixes

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