A data transfer arrangement transfers data from a source device, such as a local mass storage facility, to a destination device, such as a remote storage facility. The data transfer arrangement comprises a source device and a destination device. The source device transfers to the destination device a data block including data and padding along with a source check value that is a function of the data and selectively the padding, and a check indication indicating whether the check value is the function of the data alone, or the data and the padding. The destination device, after receiving the data block, source check value and check indication, generates a destination check value that is the function of the data alone, or the data and the padding, based on the check indication, and uses the source and destination check values to determine whether the data block was correctly received.