To ensure optimal writing quality over the entire disc at higher writing speeds, Philips has introduced the Walking OPC algorithm. WOPC directly measures and optimizes the actual writing quality during the writing process.
At certain intervals, the writing process will be briefly interrupted, the writing quality directly evaluated and the writing power adjusted accordingly, if required. The Philips DVD+R/RW writers use a more dynamic implementation based on position on the disc and temperature inside the drive. The graph below shows the writing graph of the Philips 8x DVD+R/RW on a Philips 8x DVD+R disc.