I'm having some problems about renaming some disks (setting a different alias, name or description) for VMs disks created from a template. When I get this URL

I can see are the methods sparsify, export, move and copy. I tried to POST the following XML to the previous URL with no result (as expected, it won't work)

<disk>

  <alias>my_machine_Disk1</alias>

</disk>

I'm quite sure I'm thinking about it in a wrong way (as usual). Any help would be welcome...

Thank you in advance