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There are a several very important differences between Blu-ray and HD-DVD formats.
Capacity: Since Blu-ray utilises a lens with a greater numerical aperture (NA) than HD-DVD, the laser spot can be focused with greater precision to fit more data on the same size disc. This allows Blu-ray to hold 25GB per layer (50GB on a dual-layer disc), whereas HD-DVD can only hold 15GB per layer (30GB on a dual-layer disc). Blu-ray has also adopted a higher data transfer rate for video and audio (54Mbps vs 36.55Mbps). The greater capacity and data transfer rates will allow movie studios to release their movies with higher quality video and audio than the HD-DVD format.
Content: The Blu-ray format has received broad support from the major movie studios as a successor to today’s DVD format, ensuring that in the future content will be available.
Hardware Support: The Blu-ray format has broad support from the world's leading consumer electronics, personal computer and media manufacturers, including Samsung. The Blu-ray format will also be supported in the next-generation Playstation ® 3 (PS3) video game console. This means that consumers will have a host of choices when it comes to players and hardware. The HD-DVD format has far less supporters, so the amount of players and hardware will be very limited.
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