Writing Power Balance Control Method for HD DVD

We have developed a new writing condition adjustment method for HD DVD. The conventional adjustment method developed for HD DVD has local optimality because the conventional method cannot be used to control the asymmetry of the readout signal. To solve this problem, we have proposed a new method that can be used to optimize the asymmetries of each symbol of the readout signal by manipulating the writing pulse width of each symbol. Experimental results show that the proposed method can be used to optimize the writing pulse condition with lower local optimality than the conventional method and can enlarge the writing power margin. Thus, we can realize better productivity and stability in the drives because more variations in terms of discs and drives are possible.