code: func (r Virtual_Disk_Image) GetBlockDevices() (resp []datatypes.Virtual_Guest_Block_Device, err error) {
  	err = r.Session.DoRequest("SoftLayer_Virtual_Disk_Image", "getBlockDevices", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The block devices that a disk image is attached to. Block devices connect computing instances to disk images.