code: public ArrayList<String> vps_serviceName_additionalDisk_GET(String serviceName, OvhAdditionalDiskSizeEnum additionalDiskSize) throws IOException {
  		String qPath = "/order/vps/{serviceName}/additionalDisk";
  		StringBuilder sb = path(qPath, serviceName);
  		query(sb, "additionalDiskSize", additionalDiskSize);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, t1);
  	}
docs: Get allowed durations for 'additionalDisk' option
  
  REST: GET /order/vps/{serviceName}/additionalDisk
  @param additionalDiskSize [required] Size of the additional disk
  @param serviceName [required] The internal name of your VPS offer