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# init(tag:)

Creates a configuration for a VIRTIO file system device.

```
init(tag: String)
```

## Parameters

`tag`

The label identifying this device in the guest.

## Discussion

The system presents the `tag` as a label in the guest identifying this device for mounting. The `tag` must be valid, which you can check with [`validateTag(_:)`](/documentation/Virtualization/VZVirtioFileSystemDeviceConfiguration/validateTag(_:)).

## See Also

[`validateTag(_:)`](/documentation/Virtualization/VZVirtioFileSystemDeviceConfiguration/validateTag(_:))

Checks to see whether a Virtio tag is valid.


---

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