> For the complete documentation index, see [llms.txt](https://docs.vergeos-demo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vergeos-demo.com/knowledge-base/virtual-machines/windows--slow-to-format-a-new-disk.md).

# Windows - Slow to Format a New Disk

Windows Server 2012 (and later) hosts will, by default, issue SCSI **TRIM** and **Unmap** commands equivalent to the entire size of the virtual disk. This behavior is the same even if the "Perform a quick format" option is checked, which significantly slows down the format process.

It is possible to disable the **SCSI TRIM** and **Unmap** feature on the host for the duration of the format.

## To Disable TRIM and Unmap

Using a Windows **CMD** window on the host, issue the following command:

```doscon
fsutil behavior set DisableDeleteNotify 1
```

## To Re-enable the Feature

Use the following command to re-enable the **Trim and Unmap** feature:

```doscon
fsutil behavior set DisableDeleteNotify 0
```

## To Verify the Current Setting

You can verify the current **Trim and Unmap** setting by issuing the following command:

```doscon
fsutil behavior query DisableDeleteNotify
```

The output will show one of the following:

* **DisableDeleteNotify=0** - The 'Trim and Unmap' feature is **on** (enabled).
* **DisableDeleteNotify=1** - The 'Trim and Unmap' feature is **off** (disabled).

{% hint style="info" %}
**Affected Versions**

* Only Windows Server 2012 and later hosts are affected. All earlier versions (e.g., Windows 2008) do not exhibit the same issue.
  {% endhint %}

{% hint style="info" %}
**Non-server Versions**

* Non-server versions of Windows (e.g., Windows 8.x and 10.x) do not support the **DisableDeleteNotify** parameter.
  {% endhint %}

***

{% hint style="info" %}
**Document Information**

* Last Updated: 2024-08-29
* VergeOS Version: 4.12.6
  {% endhint %}


---

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