Structure and method for storing data on optical disks

Abstract

During manufacturing of optical disks, mastering equipment inserts marks (“high frequency wobble marks” or “HFWMs”) into the wobble of the groove on optical disks to store data. The presence of a HFWM at a zero crossing of the wobble indicates an active bit and the absence of the HFWM indicates an inactive bit. The zero crossing is, for example, a negative zero crossing. A matched filter is used to detect the shape of the HFWMs. If a HFWM is detected during a wobble cycle, an active bit is saved in a register or a memory. If a HFWM is not detected during a wobble cycle, an inactive bit is saved in a register or a memory. The active and inactive bits may be coded bits that must be decoded to data bits. The data bits include information such as a synchronization mark, a sector identification data, and an error detection code.

1 . A method of storing data on an optical disk, comprising: 
 creating a spiral groove with a sinusoidal deviation from a centerline of the spiral groove on the optical disk, the sinusoidal deviation having a first frequency; and    creating sinusoidal marks in zero crossings of the spiral groove, the sinusoidal marks having a second frequency.    
   
   
       2 . The method of  claim 1 , wherein the first frequency is less than the second frequency.  
   
   
       3 . The method of  claim 1 , wherein said creating sinusoidal marks comprises inserting a sinusoidal mark in a zero crossing to indicate an active bit.  
   
   
       4 . The method of  claim 3 , wherein the zero crossings are positive zero crossings.  
   
   
       5 . The method of  claim 3 , wherein the zero crossings are negative zero crossings.  
   
   
       6 . The method of  claim 1 , wherein said creating sinusoidal marks comprises generating sinusoidal marks in phase.  
   
   
       7 . The method of  claim 1 , wherein said creating sinusoidal marks comprises generating more than one sinusoidal mark in one wobble cycle.  
   
   
       8 . The method of  claim 1 , where in said creating sinusoidal marks comprises: 
 receiving data bits;    encoding data bits to code bits according to an encoding scheme; and    generating sinusoidal marks in wobble cycles to represent code bits.    
   
   
       9 . The method of  claim 1 , wherein the sinusoidal mark has the same amplitude as the sinusoidal deviation.  
   
   
       10 . A method for reading information on an optical disk, comprising: 
 detecting zero crossings of a wobble on the optical disk;    detecting sinusoidal marks in the wobble;    outputting an inactive bit upon detecting a wobble cycle and not the sinusoidal mark; and    outputting an active bit upon detecting a sinusoidal mark.    
   
   
       11 . The method of  claim 10 , further comprising detecting a synchronization mark of a sector on the optical disk from the inactive bits and the active bits, wherein a predetermined sequence of inactive bits and active bits identifies the synchronization mark.  
   
   
       12 . The method of  claim 10 , wherein the zero crossings are positive zero crossings.  
   
   
       13 . The method of  claim 10 , wherein the zero crossings are negative zero crossings.  
   
   
       14 . The method of  claim 10 , further comprising detecting physical sector information for a sector from the inactive bits and the active bits.  
   
   
       15 . The method of  claim 14 , wherein the physical sector information includes a physical sector address.  
   
   
       16 . The method of  claim 10 , further comprising detecting an error detection code from the inactive bits and the active bits.  
   
   
       17 . A method for reading information on an optical disk, comprising: 
 determining a wobble frequency of a wobble;    detecting sinusoidal marks in the wobble according to the wobble frequency;    outputting an active bit upon detecting the sinusoidal mark; and    outputting an inactive bit when the sinusoidal mark is not detected.    
   
   
       18 . The method of  claim 17 , further comprising detecting a synchronization mark from the active bits and the inactive bits.  
   
   
       19 . The method of  claim 17 , further comprising detecting physical sector information for a sector from the active bits and the inactive bits.  
   
   
       20 . The method of  claim 17 , further comprising detecting an error correction code from the active bits and the inactive bits.