---
title: "Unmount a disk from an instance"
description: "Detach a TIR Block Storage disk from an instance by unmounting it, so you can mount it on another instance or delete it."
content_type: "how-to"
product: "tir-block-storage"
platform: "TIR"
url: "/tir/tir-block-storage/how-to/unmount-a-disk-from-an-instance/"
topic: ["connect"]
---

# Unmount a disk from an instance

Unmount a disk from an instance to free it for another instance, or before you delete it. The disk
and its files stay as they were.

## Before you begin

- A role that lets you update instances.
- Your work saved. Unmounting on a running instance restarts it, and a stopped instance applies the
  change at its next start.

## Unmount the disk

1. Open the instance's page and select the **Associated Datasets** tab.
2. Clear the tick next to the disk. **Reset** clears all your picks.
3. Select **Update**.
4. Tick **Are you sure you want to continue updating datasets?** and select **Update** again.

## Check the result

The disk loses its **Mounted** label on the **Associated Datasets** tab, and it stays in your
**Block Storage (Disk Dataset)** list with its files. You can [mount it on another
instance](/tir/tir-block-storage/how-to/mount-a-disk-on-an-instance/) or [delete
it](/tir/tir-block-storage/how-to/delete-a-disk/). For help with a message, see
[Troubleshooting TIR Block Storage](/tir/tir-block-storage/troubleshooting/tir-block-storage/).