# Detach a Disk

When you don't need additional storage of a certain instance, you can detach the disk, and then attach it to other instance if you need. Detaching a disk does not affect the data on this disk.

{% hint style="info" %} <mark style="color:blue;">**Note**</mark>

<mark style="color:blue;">Boot Disk cannot be detached.</mark>
{% endhint %}

## Prerequisites

* To prevent data loss, stop all read and write operations on all file systems of the disk.
* Before detaching a disk, make sure it has been unmounted (Linux) or it is set to offline status (Windows). Otherwise, you may fail to reattach the disk to other instances.\
  **Linux**

  Unmounting a disk in Linux using `umount` command:

  ```bash
  sudo umount /dev/disk/by-id/xxxxxx
  ```

  **Windows**\
  \&#xNAN;**-** Press **Win + X** and select **Disk Management**.\
  \- Locate the disk you want to detach, right-click on the disk, and select **Offline**.

## Procedures

1. Go to **Detach Disk** choosing one of the following ways:
   * **Instance Details** > **Information** > **Storage** > **Detach**
   * **Disk** > **Actions** > **Detach**
2. Make sure the disk is unmounted (Linux) or taken offline (Windows) as described in the previous steps, and then click **Detach**.