Q: Introduction
A: In order to burn a disc, the drive need to know things about the disc so that it could use the right power levels, calibration, etc. The collection of various parameters that determine how a drive handles a disc is called the "write strategy." All DVD discs have write strategy information physically embedded in them. But this is not enough, and for all the drives out there, their firmware contains a list of various media codes and additional write strategy information for each media code. In this thread, we will be dealing with this additional strategy information stored in the firmware.

Q: Why?
A: Sometimes, the write strategy stored in the firmware is not very good. For example, a number of the older 8x2S firmwares had a defective RITEKG05 write strategy. In cases like this, it might be useful to have the drive use another media code's write strategy instead (in this case, for example, the RITEKG06 strategy). The other situation where this might be useful is if you are overspeeding media (e.g., trying to get MCC003 to burn at 12x) and the write strategy in the firmware does not contain the necessary strategy information for higher speeds. In the case of this example, you might want to use the MCC004 write strategy for MCC003 because MCC004's write strategy contains information needed to burn the media at 12x and MCC003's strategy does not.

Q: What do I need for this?
A: OmniPatcher, preferably version 2.2.0 or newer.

Q: How do I change write strategies?
A: There are two ways to change write strategies in LiteOn drives. The first is to use OmniPatcher's write strategy reassignment function. This will allow you to, for example, assign a MCC004 write strategy to MCC003. This method is "lossless", has no side effects, and is the recommended method. The other method is write strategy swapping. In this case, you would use OmniPatcher's media code renaming feature to, for example, rename the MCC003 media code to MCC004 and rename the MCC004 media code to MCC003. The result is that MCC003 will now use MCC004's write strategy, but you get the side effect of having MCC004 use MCC003's write strategy (whereas if you had used reassignment, both would be using the MCC004 write strategy). Thus, the greatest limitation of strategy swapping is that each write strategy can be used by at most one media code whereas in the case of strategy reassignment, each write strategy can be used by as many media codes as desired. Strategy swapping is thus not recommended and should be used only in cases where strategy reassignment is not an available option.

from：http://club.cdfreaks.com/showthread.php?t=100190