What is one major difference between HD-DVD and Blu-ray technologies?

One major difference between HD-DVD and Blu-ray technologies is the depth of the data image on the disc surface. Blu-ray discs are able to store more data compared to HD-DVDs due to their different disc construction and the way the laser technology works. Blu-ray uses a blue-violet laser with a shorter wavelength (405 nm) than the red laser used by HD-DVD (650 nm), allowing Blu-ray to read and write data more precisely and densely packed. This results in a higher storage capacity for Blu-ray discs, which can hold up to 25 GB on a single-layer disc and 50 GB on a dual-layer disc, whereas HD-DVDs typically hold up to 15 GB on a single layer and 30 GB on a dual layer. This increased storage capacity is critical for delivering high-definition video and more complex audio formats.