} else if offsetBegin, err = strconv.ParseInt(offsetBeginString, 10, 64); err != nil {
			return nil, fmt.Errorf("'%s' does not have a valid first byte position value", rangeString)
		} else if offsetBegin < 0 {
			return nil, fmt.Errorf("First byte position is negative ('%d')", offsetBegin)
		}
	}

	offsetEndString := byteRangeString[sepIndex+1:]
	offsetEnd := int64(-1)

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidCopyPartRange: {
		Code:           "InvalidArgument",
		Description:    "The x-amz-copy-source-range value must be of the form bytes=first-last where first and last are the zero-based offsets of the first and last bytes to copy",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidCopyPartRangeSource: {
		Code:           "InvalidArgument",

			if r == nil {
				onlineDisks[i] = OfflineDisk
			}
		}
		// Track total bytes read from disk and written to the client.
		totalBytesRead += partLength
		// partOffset will be valid only for the first part, hence reset it to 0 for
		// the remaining parts.
		partOffset = 0
	} // End of read all parts loop.
	// Return success.
	return nil
}

// handle all cases where we have known types of errors returned by
// underlying storage layer.
func toObjectErr(oerr error, params ...string) error {
	if oerr == nil {
		return nil
	}

	// Unwarp the error first
	err := unwrapAll(oerr)

	if err == context.Canceled {
		return context.Canceled
	}

	switch err.Error() {
	case errVolumeNotFound.Error():
		apiErr := BucketNotFound{}
		if len(params) >= 1 {