MULTI-LAYER OPTICAL DISCS

摘要

An optical record carrier (30) comprising a plurality of information layers formed above a first surface of a substrate wherein at least one of the information layers is are- writable cache layer is disclosed. The data that is read more than once is copied on to the re- writable cache layer when the recording/reproducing device is not in active use. Next time when the same data is requested, it can be read from the re-writable cache layer. This is advantageous since the data is stored un-fragmented on the re-writable cache layer and the re- writable cache layer can have higher read speeds than the other information layers in the optical record carrier. Therefore, the re-writable cache layer can improve the system performance in terms of read speed.