A record carrier has information represented by high density read-only marks in a track. The read-only marks(74,75) are optically readable according to a predefined high-density data format such as CD or DVD via a beam of radiation by first variations of the radiation. The record carrier has a recordable layer(70) for writing recorded marks(72,73) in a recording area of the record carrier, which recording area extends over the track(9) carrying the read-only marks. The recordable layer(70) is arranged to generate second variations of the radiation by a difference between an unrecorded state and a recorded state. A recording device writes recorded marks on top of the read-only marks. A read device recovers the first and second variations, and detects the read-only marks and the recorded marks from a same part of the track. |