Writing method of data, reading method of data, and optical disc drive

An optical disc drive comprising:

• at least one optical pickup unit;
• an optical disc controller that controls operations of the optical pickup unit;
• an interface circuit that communicates with a host device;
• and
• a system control circuit that controls the communication with the host device, operates the optical disc controller based on an instruction from the host device, and controls an operation corresponding to the instruction,
• the optical disc drive being configured to write data into a write-once optical disc having a plurality of recording layers on at least one surface of the write-once optical disc,
• wherein
• in each of the plurality of recording layers, two tracks into which data is written, the two tracks being constituted of adjacent land and groove, are formed in a spiral shape, and a user data area where user data is recordable is set, and
• (x) the system control circuit receives data and a writing instruction of the data from the host device through the interface circuit, and
• the system control circuit operates the optical disc controller to execute operations for the write-once optical disc, the operations including:
• (a) an operation of recording management information that includes:
• virtual sequential recording range information (VSRRI) that manages, as a virtual physical sector number (PSN_D), a last recorded address of data (VLRA) in each of a plurality of virtual sequential recording ranges (VSRR) ensured in advance;
• defect list (DFL) that shows a replacement correspondence relationship between the virtual physical sector number (PSN_D) and an actually recorded physical sector number (PSN_R);
• and
• real next writable address information (RNWAI) that indicates a real next writable address (RNWA) actually subjected to additional writing subsequently to the physical sector number (PSN_R);
• (b) an operation of converting a logical sector number (LSN) which indicates a writing position of the received data, into the virtual physical sector number (PSN_D);
• (c) an operation of writing the data into the real next writable address (RNWA) of each user data area of the plurality of recording layers in response to the writing instruction,
• the operation (c) including:
• (c0) an operation of designating, as an operation layer, a first recording layer among the plurality of recording layers;
• (c1) an operation of sequentially writing data along a first track of the user data area in the operation layer;
• (c2) an operation of sequentially writing data along a second track of the user data area after the recording to the first track of the user data area is completed;
• and
• (c3) an operation of newly designating, as an operation layer, a recording layer present at a position closer than the operation layer when viewed from a laser-light incident side, and writing data by the operation (c1) and the operation (c2);
• and
• (d) an operation of updating the defect list (DFL) and adding information of a replacement correspondence relationship between the virtual physical sector number (PSN_D) of the designated data and the actually recorded physical sector number (PSN_R) that is the real next writable address (RNWA) at a point of time when the data is written.