Defect managing method and defect managing device
AssigneePanasonic Corporation
InventorsYoshihisa Takahashi, Motoshi Ito
Life of this patent
Estimating the term…
Abstract
Performing sequential recording to alternate destinations of an information recording medium and improving access performance of accessing the information recording medium are achieved by estimating sequential defective areas of the information recording medium based on prescribed conditions, allocating blocks of a spare area as alternate destinations of the defective areas, and performing alternate recording to the allocated alternate destinations, in response to a recording request to record information to the sequential defective areas. The above can be achieved because the use of the alternate destinations will help to prevent a time-out from occurring due to he the defective areas.
Claims18
A defect management method of managing defects of an information recording media having a plurality of layers including a plurality of recording layers and in which recording/reproducing processing is performed in a block unit of an error correcting unit, said defect management method including,
- when a defective block, which meets a prescribed defect judgment condition, is detected in one recording layer of the plurality of recording layers:
- registering an area of a prescribed range decided based on the defective block detected in the one recording layer, in a defect list as a defective area;
- and
- registering in the defect list, an area of a range in another recording layer, of the plurality of recording layers, corresponding to a position of a same radius as a radius of the prescribed range, as the defective area,
- wherein the information recording media includes a plurality of spare areas for replacing the defective block,
- wherein the plurality of spare areas, which successively allocate alternate blocks for the defective area as alternate destinations of the defective block included in the defective area, are preferentially used, and
- wherein, when the alternate blocks cannot be sequentially allocated to any one spare area of the plurality of spare areas as an alternate destination of the defective block included in the defective area, a spare area, of the plurality of spare areas, to which a longest sequential alternate block can be allocated as the alternate destination of the defective block is preferentially used.
A defect management device for managing defects of an information recording medium having a plurality of layers including a plurality of recording layers, and for performing recording/reproducing processing in a block unit of an error correcting unit, the defect management device comprising:
- a system control part which performs control of an overall device;
- a memory part which stores each kind of information temporarily for performing the control by the system control part;
- a motor part which rotates the information recording medium;
- an optical pickup part which records data into the information recording medium or reads the data from the information recording medium;
- a data buffer which stores data to be recorded and read-out data temporarily;
- and
- a DFL information storage buffer which holds a defect list having information regarding a defective block of the information recording medium,
- wherein, when the system control part detects the defective block in one recording layer of the plurality of recording layers, which meets a prescribed defect judgment condition, an area of a prescribed range decided based on the defective block detected in the one recording layer is registered in the defect list as a defective area,
- wherein an area of a range in another recording layer, of the plurality of recording layers, corresponding to a same radius position as that of the prescribed range is registered in the defect list as the defective area,
- wherein the information recording medium includes a plurality of spare areas for replacing the defective block,
- wherein the plurality of spare areas, which successively allocate alternate blocks for the defective area as alternate destinations of the defective block included in the defective area, are preferentially used, and
- wherein, when the alternate blocks cannot be sequentially allocated to any one spare area of the plurality of spare areas as an alternate destination of the defective block included in the defective area, a spare area, of the plurality of spare areas, to which a longest sequential alternate block can be allocated as the alternate destination of the defective block is preferentially used.
Dependencies are inferred from the claim text.