def get_disk(client, resource_group, disk_name):
    """Get disk info from Azure

    :param client: Azure object using ComputeManagementClient
    :param resource_group: string, name of Azure resource group
    :param disk_name: string, name of disk
    :return: class:`Resource <Resource>` object
    :rtype:
    class 'azure.mgmt.compute.compute.v2016_04_30_preview.models.disk.Disk'
    """
    return client.disks.get(resource_group, disk_name)