Had a mod chip installed in my ps2 v.7, and was told my lazer needed adjustment to read backups. The installer said he had to boost up power supply to lazer and adjust lazer reading angle. Will this affect the life of the lazer, and by how much? Also is the lazer replacable in the case of failure? Also who ever reads this, by experience what's your personal opinion on the best type of DVD media to make backups?