Abstract:
A record carrier provided with at least two parallel information layers (20, 21) suitable to be scanned by means of a single scanning head is described. Each information layer is provided with a control block (26, 31) in which information is stored which can be used for reading the user information stored in this information layer. The control blocks are placed in the record carrier in such a way that they can be sequentially read by means of a scanning device, with a minimum displacement of the scanning head. The user information may be stored in a first format in the first information layer, and the same user information may be stored in a second format in a second information layer. The first format may be a low-density structure and the second format may be a high-density structure.
Abstract:
A disc-like record carrier (1) is disclosed on which control information is recorded. The control information comprises diameter information which is indicative of the diameter of the record carrier. An information recording and/or reading apparatus comprises a drive means (2) for rotatingly driving the disc-like record carrier (1). The apparatus comprises a control unit (5) which adapts the loop gain of a control loop (2, 3, 7, 8, 9) for controlling the number of revolutions per minute of the record carrier (1) in dependence on the control information recorded on the record carrier.
Abstract:
Audio-centered information is stored on a unitary medium by using a Table-of-Contents (TOC) mechanism that specifies an actual configuration of various audio items on the medium. In particular, each one of a set of one or more Track Areas gets at least two mutually logically conforming Sub-TOCs assigned. This allows to retrieve any constituent Sub-TOC part from at least any correct copy of the Sub-TOCs. Furthermore, one or more Master-TOCs are provided for specifically pointing to each of the Sub-TOCs.