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SFC vs DISM: What's the Difference?

By Iikka Isosaari · Windows 11 · Updated September 26, 2026

SFC and DISM are frequently mentioned together, but they repair different parts of Windows.

Understanding the difference makes troubleshooting much easier.

Before repair commands: save your work, keep a backup of important files, and use Terminal or Command Prompt as Administrator. These commands change Windows files; they are not read-only diagnostics. /Online targets the Windows installation currently running, not an offline installation in recovery.

SFC Repairs Windows System Files

System File Checker uses:

sfc /scannow

It checks protected Windows system files and replaces corrupted versions when possible.

Think of SFC as repairing the files Windows is actively using.

DISM Repairs the Windows Image

DISM commonly uses:

DISM /Online /Cleanup-Image /RestoreHealth

DISM repairs the Windows component store.

This component store is one of the sources Windows can use when repairing system files.

Why DISM Can Fix SFC Problems

Imagine SFC discovers a damaged Windows file.

Normally, it replaces that file with a healthy copy.

But what happens if the healthy copy is also damaged?

SFC may fail.

DISM can repair the underlying Windows image first.

You can then run SFC again.

Recommended Sequence

For many corruption-related Windows problems, a useful sequence is:

DISM /Online /Cleanup-Image /RestoreHealth

followed by:

sfc /scannow

Restart the PC afterward.

Should You Run Them Regularly?

There is generally no need to run SFC and DISM every day.

They are diagnostic and repair utilities, not performance boosters.

Use them when Windows shows signs of system corruption or when troubleshooting indicates that Windows components may be damaged.

References

• Microsoft: DISM and System File Checker