Abstract: An optical disk apparatus for enabling to insert a multi-layered optical disk therein, which has plural numbers of recording layers, comprising: a spindle motor 42; an optical pickup 2; and a system controller 100 for controlling the optical pickup to move into a radial direction of the optical disk, as well as, for controlling the optical pickup so that a light-beam irradiated therefrom is focused upon either one of the plural numbers of recording layers of the optical disk, wherein when it is determined that the target layer to be accessed lies on a layer different from that, upon which the optical pickup focuses the light-beam at present, the light-beam irradiated from the optical pickup is shifted to the target layer, after being moved into a radial direction of said optical disk on the layer, upon which the light-beam irradiated therefrom is focused at present, up to an information recording area where the information of the target layer is recoded.

Abstract: An optical disc apparatus capable of performing self-diagnosis receives from a host computer a command to enable a self-diagnostic mode. Information indicating that the self-diagnosis mode is specified is written to a ROM in the optical disc apparatus. Product inspection is performed while the optical disc apparatus is not connected to the host PC. The optical disc apparatus checks whether the information has been written to the ROM. When the information is written to the ROM, the optical disc apparatus performs self-diagnosis mode inspection. When the optical disc apparatus is connected to the host PC to allow for the establishment of communications by use of an out-of-band signal, the information written to the ROM is erased on the assumption that the connection has been established. This eliminates an unnecessary command and prevents a malfunction caused by the self-diagnostic mode in a destination site.

Abstract: An optical disc apparatus capable of performing self-diagnosis receives from a host computer a command to enable a self-diagnostic mode. Information indicating that the self-diagnosis mode is specified is written to a ROM in the optical disc apparatus. Product inspection is performed while the optical disc apparatus is not connected to the host PC. The optical disc apparatus checks whether the information has been written to the ROM. When the information is written to the ROM, the optical disc apparatus performs self-diagnosis mode inspection. When the optical disc apparatus is connected to the host PC to allow for the establishment of communications by use of an out-of-band signal, the information written to the ROM is erased on the assumption that the connection has been established. This eliminates an unnecessary command and prevents a malfunction caused by the self-diagnostic mode in a destination site.

Abstract: An optical disk apparatus for enabling to insert a multi-layered optical disk therein, which has plural numbers of re-writable recording layers, comprising: a spindle motor 42; an optical pickup 2; and a system controller 100 for controlling the optical pickup to move into a radial direction of the optical disk, as well as, for controlling the optical pickup so that a light-beam irradiated therefrom is focused upon either one of the plural numbers of recording layers of the optical disk, wherein when it is determined that the target layer to be accessed lies on a layer different from that, upon which the optical pickup focuses the light-beam at present, the light-beam irradiated from the optical pickup is shifted to the target layer, after being moved into a radial direction of said optical disk on the layer, upon which the light-beam irradiated therefrom is focused at present, up to an information recording area where the information of the target layer is recoded.