Member Avatar for Christiaan

I get the defrag window, but when I click on "Defragment' or even on 'Analyze', nothing happens. Any advice please?
Christiaan.

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OP sees the Disk Defragmenter GUI open but nothing happens when clicking Analyze or Defragment. Start with a few safe checks: make sure the account used has administrative rights, look in Task Manager for heavy disk activity or a hung defrag process, and try the built-in command-line defragmenter so any error text is visible (use defrag C: /A to analyze or defrag C: to run). Microsoft documents the defrag command here: Defrag (Windows command).

Run a filesystem check before defragmenting because errors will prevent or break the operation. From an elevated prompt run chkdsk C: /f and reboot to let it fix problems; see chkdsk documentation. As noted, booting to Safe Mode reduces running drivers and apps that can lock files, so try defrag there if the normal boot fails. If the command-line tool still fails, inspect Event Viewer (System and Application logs) for related errors and note Event IDs/messages for diagnosis.

A reputable third-party defragmenter can be a fallback (this echoes 's direction), but always back up important data first and ensure the tool is compatible with the OS. If SMART or Event Viewer entries point to hardware faults, stop defragment attempts and run disk diagnostics — data backup should be the immediate priority.

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Member Avatar for willcomp

Defrag should always be run in Safe Mode otherwise it may have trouble starting and/or will restart before finishing resulting in an endless loop.

Member Avatar for Christiaan

Thanks, I'll remember that.

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