code: func (c *StorageGateway) AddWorkingStorage(input *AddWorkingStorageInput) (*AddWorkingStorageOutput, error) {
  	req, out := c.AddWorkingStorageRequest(input)
  	return out, req.Send()
  }
docs: // AddWorkingStorage API operation for AWS Storage Gateway.
  //
  // Configures one or more gateway local disks as working storage for a gateway.
  // This operation is only supported in the stored volume gateway type. This
  // operation is deprecated in cached volume API version 20120630. Use AddUploadBuffer
  // instead.
  //
  // Working storage is also referred to as upload buffer. You can also use the
  // AddUploadBuffer operation to add upload buffer to a stored volume gateway.
  //
  // In the request, you specify the gateway Amazon Resource Name (ARN) to which
  // you want to add working storage, and one or more disk IDs that you want to
  // configure as working storage.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Storage Gateway's
  // API operation AddWorkingStorage for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/AddWorkingStorage