Optical disc and method of identifying recording layer

Abstract

An optical disc in which a physical address of each smallest recording unit and a recorded address increase or decrease on first and second recording layers, and a method of identifying the recording layers. Embodiments are provided for discs having first and second recording layers with a same or an opposite track spiral direction. Physical addresses of the smallest recording units and a recorded address are increased or decreased between an inner radius and an outer radius of a recording layer in a manner which enables a reproducing and/or a recording device to more rapidly reproduce and/or record data on the disc. A physical address of the smallest recording units on the first recording layer is made different from a physical address of the smallest recording units on the second recording layer.

1 . A method of recording data to an optical disc comprising first and second recording layers, the method comprising: 
 identifying a recording layer to be recorded as being either the first or the second recording layer according to whether recording addresses of smallest recording units recorded while recording data on the disc decrease as physical addresses of the smallest recording units increase or increase as the physical addresses decreases so as to distinguish between the first and second recording layers, and    recording data to the identified recording layer.    
   
   
       2 . The method of  claim 1 , wherein the physical address is recorded in a form of pits at a front portion of each smallest recording unit.  
   
   
       3 . The method of  claim 1 , wherein the physical address is recorded on a track in a form of a wobble.  
   
   
       4 . A method of recording data on an optical disc having first and second recording layers, the method comprising: 
 detecting addresses in respective front portions of smallest recording units of the first and second recording layers to detect first and second trends, the recording addresses and corresponding physical addresses of the first recording layer varying together according to a direction of travel on the disc to define the first trend, and the recording addresses and corresponding physical addresses of the second recording layer varying together according to the direction of travel to define the second trend;    identifying a recording layer as being the first recording layer if the first trend is detected and recording the data from the identified first recording layer; and    identifying a recording layer as being the second recording layer if the second trend is detected and recording the data from the identified second recording layer.    
   
   
       5 . The method of  claim 4 , wherein the recording and physical addresses of the first recording layer and the recording and physical addresses of the second recording layer all increase or all decrease together.  
   
   
       6 . The method of  claim 4 , wherein: 
 the recording and physical addresses of the first recording layer increase together; and    the recording and physical addresses of the second recording layer decrease together.    
   
   
       7 . The method of  claim 4 , wherein: 
 the recording and physical addresses of the first recording layer decrease together; and    the recording and physical addresses of the second recording layer increase together.    
   
   
       8 . A method of recording data to an optical disc having first and second recording layers, the method comprising: 
 identifying a recording layer to be recorded as being either the first or the second recording layer according to a detected trend of recording addresses in respective front portions of smallest recording units of the first and second recording layers, the recording addresses and the physical addresses of one of the first and second recording layers varying according to a direction of travel along the disc, and the recording addresses and the physical addresses of the other of the first and second recording layers varying oppositely according to the direction of travel; and    recording data to the identified recording layer.    
   
   
       9 . The method of  claim 8 , wherein: 
 the recording and physical addresses of the first recording layer vary together, and    the recording and physical addresses of the second recording layer vary oppositely.    
   
   
       10 . The method of  claim 8 , wherein: 
 the recording and physical addresses of the second recording layer vary together, and    the recording and physical addresses of the first recording layer vary oppositely.    
   
   
       11 . A method of recording data to an optical disc having first and second recording layers, the method comprising: 
 identifying a recording layer as being either the first or second recording layer according to a detected trend of a recording addresses in respective front portions of smallest recording units of the first and second recording layers, wherein the recording addresses and the physical addresses of one of the first and second recording layers vary oppositely according to a direction of travel along the disc, and the recording addresses and the physical addresses of the other of the first and second recording layers vary oppositely according to the direction of travel along the disc; and    recording data to the identified recording layer.