Information recording device and method, and computer program

An information recording apparatus capable of recording at least first and second user data onto an information recording medium on which at least a first recording layer and a second recording layer are laminated,

• said information recording apparatus comprising:
• a writing device capable of writing each of the first and second user data;
• a writing controlling device for controlling said writing device to write each of the first and second user data such that each of the first and second user data bridges over the first recording layer to the second recording layer;
• and
• a border controlling device for controlling said writing device to write first border information into a recording area which is a border between the first and second user data in the first recording layer, and to write or ensure second border information in a recording area of the second recording layer, which is overlapped with the recording area of the first recording layer in which the first border information is written, as a recording area which is to be a border between the first and second user data in the second recording layer, wherein
• each of the first recording layer and the second recording layer includes a user data area,
• said border controlling device controls said writing device (i) to write the first border information in the user data area of the first recording layer and (ii) to write the second border information in the user data area of the second recording layer,
• the information recording medium is disc-shaped,
• said writing controlling device controls said writing device to write a former half portion of each of the first and second user data into the first recording layer in a recording direction from one side to the other side out of an inner circumferential side and an outer circumferential side of the information recording medium, and to write a latter half portion of each of the first and second user data into the second recording layer by reversing the recording direction, and
• said border controlling device has:
• a first border controlling device for controlling said writing device to write first start border information which indicates a start border in the first recording layer of the former half portions, as one of the first border information, into the one side of the start border in the first recording layer, and to write or ensure second end border information which indicates an end border in the second recording layer of the latter half portion, as one of the second border information, into the second recording layer in a same radial position as that of the first start border information, after writing of each of the first and second user data;
• and
• a second border controlling device for controlling said writing device to write first end border information which indicates an end border in the first recording layer of the former half portion, as another one of the first border information, into the other side of the end border in the first recording layer, and to write or ensure second start border information which indicates a start border in the second recording layer of the latter half portion, as another one of the second border information, into the second recording layer in a same radial position as that of the first end border information, after writing of each of the first and second user data,
• said second border controlling device controls said writing device to write buffer data or a jump prohibitive flag, as at least one portion of the first end border information, in order to prevent a writing position by said writing device from deviating to the other side through the first end border information from the end border of the first recording layer,
• said first border controlling device controls said writing device to write the first start border information after the writing of each of the first and second user data, and then to write or ensure the second end border information after the writing of the first start border information, and
• said second border controlling device controls said writing device to subsequently write the first end border information after the writing or the ensuring of the second end border information, and then to write or ensure the second start border information after the writing of the first end border information.