What does the "Disable Scheduled Defrag" tweak change in Windows?

It runs schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /disable and 1 more command. The full list is in the table on this page, read from the app's source.

Is "Disable Scheduled Defrag" safe to switch on?

Use it only if you will run the optimization yourself. Moving the schedule to a quiet hour is easier. The main cost: An SSD that never receives a scheduled TRIM can slow down over months, and a hard disk fragments.

Is "Disable Scheduled Defrag" free in Frozen Tweaks?

It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

Disable scheduled defrag and TRIM (ScheduledDefrag task): should you?

Frost LIVECleanProUndo: YesUpdated Oct 8, 2026View as Markdown

Short answer

Updated Oct 8, 2026

Windows runs a weekly task that defragments hard disks and sends TRIM to SSDs, and Storage Sense has its own cleanup task. This tweak disables both tasks until you switch it off again. It runs schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /disable and 1 more command.

In the app

Disable Scheduled DefragPRO

Command

schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /enableschtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /disable

What the switch writes. Your current value may differ. 1 more change below.

What it does

Windows runs a weekly task that defragments hard disks and sends TRIM to SSDs, and Storage Sense has its own cleanup task. This tweak disables both tasks until you switch it off again.

In the app the switch is called "Disable Scheduled Defrag", described there as: Turns off the scheduled defrag and TRIM task and the Storage Sense cleanup task until you switch this off.

When it helps, and when it hurts

When it helps

Keeping drive optimization from starting while you play, which matters most on hard disks.

When it hurts

An SSD that never receives a scheduled TRIM can slow down over months, and a hard disk fragments.
Run 'Optimize drives' by hand every few weeks if you keep this on.

What it writes

Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.

With the tweak · CMD

schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /disable
schtasks /change /tn "\Microsoft\Windows\DiskCleanup\SilentCleanup" /disable

Switching it off · CMD

schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /enable
schtasks /change /tn "\Microsoft\Windows\DiskCleanup\SilentCleanup" /enable

From the app's source (sched_defrag_off.hpp), app 2.0.0, checked Oct 8, 2026.

How to undo it

In the app: Yes

Switching it off sets a standard Windows value, which may not be exactly how you had it.

Switch the tweak off in Frozen Tweaks. It runs the commands shown under "Switching it off".

Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.

Verdict

Use it only if you will run the optimization yourself. Moving the schedule to a quiet hour is easier.

Questions

What does the "Disable Scheduled Defrag" tweak change in Windows?: It runs schtasks /change /tn "\Microsoft\Windows\Defrag\ScheduledDefrag" /disable and 1 more command. The full list is in the table on this page, read from the app's source.
Is "Disable Scheduled Defrag" safe to switch on?: Use it only if you will run the optimization yourself. Moving the schedule to a quiet hour is easier. The main cost: An SSD that never receives a scheduled TRIM can slow down over months, and a hard disk fragments.
How do I undo it?: Switch the tweak off in Frozen Tweaks. Switching it off sets a standard Windows value, which may not be exactly how you had it.
Is "Disable Scheduled Defrag" free in Frozen Tweaks?: It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

In the app