Detection of data in burst cutting area of optical disk

An apparatus for reading and writing optical disks, each having a burst cutting area comprising markings and data (DA), the apparatus comprising:

• an optical scanning unit for at times scanning the burst cutting area during witting of outgoing data to the burst cutting area, the outgoing data having a data frequency spectrum (DFS), and for at times scanning the burst cutting area to obtain a read signal (ES) being dependent on both the markings and the data (DA), a frequency spectrum of the read signal comprising a marking frequency spectrum (MFS) and the data frequency spectrum (DFS), and
• a processor for at times processing the read signal (ES) to retrieve both the data (DA) and the markings by using filters corresponding to the data frequency spectrum (DFS) and the marking frequency spectrum (MFS), respectively, and for at times generating the processed data (PD), and
• an encoder for receiving processed data (PD) to supply the outgoing data (OD) having an outgoing data frequency spectrum (DFS) with suppressed DC-content, and
• a decoder for decoding the data by replacing data sequences with respective decoded data sequences to form output data, the output data at times having more low frequency content than the data sequences, and
• wherein the encoder suppresses a low frequency component of the outgoing frequency spectrum (DFS) which would otherwise cause interference with a frequency component of the marking frequency spectrum (MFS) by a selection between alternative output data sequences for identical processed data sequences.