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# init(attachment:)

Creates a block device configuration object that uses the specified storage medium.

```
init(attachment: VZStorageDeviceAttachment)
```

## Parameters

`attachment`

The attachment object that provides the storage for the device. For example, specify a [`VZDiskImageStorageDeviceAttachment`](/documentation/Virtualization/VZDiskImageStorageDeviceAttachment) object to implement the storage using a local disk image on the host computer.

## Return Value

A block storage device configuration object to include in your virtual machine’s configuration.

## Discussion

---

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