1. Types
2. vcenter
3. vm
4. hardware
5. disk

## vcenter vm hardware disk: update spec

The `update_spec` structure describes the updates to be made to the configuration of a virtual disk.

### Representations:

- JSON
- XML

{
"backing": {
"type": "VMDK_FILE",
"vmdk_file": "string"
}
}
<?xml version="1.0" ?>
<ns0:UpdateSpec xmlns:ns0="http://vmware.com/vcenter/vm/hardware/disk" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<backing>
<vmdk_file>string</vmdk_file>
<type>VMDK_FILE</type>
</backing>
</ns0:UpdateSpec>

#### Attributes:

Name | Type | Description
--- | --- | ---
Optional
backing | backing_spec | Physical resource backing for the virtual disk. This field may only be modified if the virtual machine is not powered on. Optional. If unset, the value is unchanged.