> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nebius.com/llms.txt
> Use this file to discover all available pages before exploring further.
# How to detach additional volumes from virtual machines
You can detach a [secondary disk](./types#disks) or a [shared filesystem](./types#shared-filesystems) from a VM. You cannot detach a boot disk.
## Steps
### Get the disk's device ID or the filesystem's mount tag
1. In the sidebar, go to **Storage** → **Disks** or **Storage** → **Shared filesystems**.
2. Copy the device ID from the list of disks or the mount tag from the list of filesystems.
Get the VM's specification:
```bash theme={null}
nebius compute instance get
```
Alternatively, list all VMs:
```bash theme={null}
nebius compute instance list
```
In the output, you can find device IDs of disks and mount tags of filesystems in `.spec.secondary_disks[].device_id` and `.spec.filesystems[].mount_tag`, respectively:
```yaml theme={null}
spec:
secondary_disks:
- attach_mode: READ_WRITE
existing_disk:
id: computedisk-***
device_id: newdisk
filesystems:
- attach_mode: READ_WRITE
existing_filesystem:
id: computefilesystem-***
mount_tag: shared-fs
```
### Make sure that the VM does not mount the volume when the VM restarts
1. [Connect to the VM over SSH](../virtual-machines/connect#connect-to-the-vm-using-ssh).
2. Switch to the `root` user:
```bash theme={null}
sudo su -
```
3. If you want to detach a secondary disk, get its UUID:
```bash theme={null}
blkid /dev/disk/by-id/virtio-disk-0-part1 -o export | grep "^UUID"
```
In this example, we assume that you have named the device `disk-0`; for disks, all device IDs are prefixed with `virtio-`.
4. Open `/etc/fstab` with your preferred text editor, for example, `nano /etc/fstab`, and delete the lines that refer to the volumes:
* The line for a disk should start with its UUID:
```text theme={null}
UUID= /mnt/disk-0 ext4 defaults,nofail 0 2
```
* The line for a filesystem should start with the filesystem's mount tag from the VM specification:
```text theme={null}
filesystem-0 /mnt/fs virtiofs rw,nofail 0 0
```
In this example, the filesystem has the mount tag `filesystem-0` and is mounted at `/mnt/fs`.
5. Disconnect from the VM.
### Remove the volume from the VM's specification
1. In the sidebar, go to **Compute** → **Virtual machines**.
2. Open the page of the required VM.
3. Click **Stop VM** and then confirm it.
You can detach a disk from a running VM, but this can cause data loss or corruption.
4. After the VM's status becomes `Stopped`, switch to the **Disks** or **Filesystems** tab.
5. Next to the disk or filesystem, click → **Detach**.
6. After the volume is detached, click **Start VM** and then confirm it.
1. Stop the VM:
```bash theme={null}
nebius compute instance stop --id
```
You can detach a disk from a running VM, but this can cause data loss or corruption.
2. Start editing the VM specification:
```bash theme={null}
nebius compute instance edit
```
3. In the text editor that opens, remove the disk or filesystem from the `.spec.secondary_disks` or `.spec.filesystems` list, respectively. If, after that, a list becomes empty, remove it entirely. For example:
```diff theme={null}
spec:
boot_disk:
attach_mode: READ_WRITE
device_id: ""
existing_disk:
id: computedisk-***
- secondary_disks:
- - attach_mode: READ_WRITE
- existing_disk:
- id: computedisk-***
- device_id: newdisk
gpu_cluster:
...
```
4. After making the changes, save the file. The CLI updates the VM automatically.
5. Start the VM:
```bash theme={null}
nebius compute instance start --id
```
You can [attach and mount](./use) different additional volumes to the VM later.