When running the Windows optimization tool, many users encounter the Windows 10 defrag optimization not available issue. If you are also trying to resolve it, you come to the right place. This post of MiniTool summarizes 5 effective fixes.

Disk Defragmenter is a widely used Microsoft utility that can be used to improve hard disk performance. Sometimes, however, you may encounter some issues like disk defragmenter was scheduled using another program, disk defragmenter not working, and the one discussed here.

According to user reports, the optimization not available Windows 10 issue occurs when they access the Defragment tool via File Explorer. They found the Analyze and Optimize buttons can’t be used too, and the Media type status displays “Unknown”, and the Last analyzed on or Last run column may show “Never run”.

Optimization not available

Now, let’s see how to fix Windows 10 defrag optimization not available.

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Method 1. Use Command Line to Defrag Your Drive

If you can’t optimize system reserved by using the Defragment tool in File Explorer, you can utilize the Command Line to defrag your drive. Here’s how to do that:

Step 1. Type cmd in the search box on the taskbar. And then right-click the Command Prompt app and select Run as administrator.

run CMD as administrator

Step 2. In the elevated command prompt, you can perform an analysis for a specific volume. For example, type defrag c: /A and hit Enter. This command will analyze the fragmentation status of your C drive on the hard disk. Note that replace the c with the drive that you want to analyze.

Step 3. If the drive is fragmented, you can continue to run the defrag c: /U /V command. Then the command will run the defragmentation operation on your C drive.

Tip: If you want to defrag an SSD, run the defrag c: /L /O command instead, which can instruct defrag to run a trim command once the operation completes and to run the proper optimization for your media type.

Method 2. Use Third-party Defragmentation Software

In addition to the Windows built-in tools, you can use third-party defragment software like CCleaner Defraggler, Auslogics Disk Defrag, and so forth. To know more details, you can refer to this post “Best Defragmentation Software to Handle Disk Fragmentation”.

Method 3. Delete the Statistics Keys of Defrag

Some users reported that the “system drive won’t optimize” issue can be solved by deleting the corrupt defrag statistics keys. Windows will recreate these keys after you delete them. Here make sure that you back up the registry or create a system restore point in case anything goes wrong.

Step 1. Press Win + R keys to open the Run dialog box, and then type regedit in it and hit Enter.

Step 2. In the Registry Editor window, locate the following path via the left navigation bar.


Step 3. Select all subkeys under the Statistics key, delete them, and reboot your computer. After that, you can reopen the Windows defragment tool and see if the “system drive won’t optimize” issue is fixed.

delete all subkeys under the Statistics

Method 4. Run Disk Defragmenter in Safe Mode

If you can’t optimize system reserved using the tool in File Explorer, you can try running Disk Defragmenter in Safe Mode. Safe Mode enables users to run with only default settings and drivers, which can minimize the software conflicts and help fix the defrag issue. If you don’t know how to start Windows 10 in Safe Mode, this post provides you with detailed steps.

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Method 5. Check Hard Drive Errors

If none of these ways fix the optimization not available Windows 10 issue, you can check if there are any errors on the hard drive. CHKDSK is a useful tool that can help fix hard drive errors. Here’s a simple guide to use it.

Step 1. Open the Command Prompt app as an administrator.

Step 2. In the elevated command prompt, type chkdsk e: /f/ command and hit Enter. (Note: represents the drive letter that you want to scan and repair.)

repair hard drive errors

Once this repairing process completes, you can relaunch Disk Defragmenter and see if the error disappears.

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