45GB HD DVDs: Triple-Layer-Tastic

Still not as big as a dual layer Blu-ray disc though...

All this talk of Blu-ray and HD DVD possibly sending each other affectionate notes from across the classroom over recent months has made a lot of us forget that – until we officially hear otherwise – there is a format war going on. At current tally HD DVD may be suffering more casualities than Blu-ray, but it has struck back today with a 45GB disc.


Now given that single sided HD DVD discs are 15GB and dual layer are 30GB, it does taken a mathematical genius to spot that the latest media is triple layered. How did they manage to put this extra jammy layer of memory goodness in the middle? Actually, it is not as clever as it sounds. It was achieved simply by back-to-back bonding a 0.6mm dual layer disc and a 0.6mm single layer disc. A little like an elaborate sponge cake.

Best news in all of this (and in fact HD DVD’s major trick in general) it that these 45GB discs are still backwards compatible with existing DVD drives. Sadly for HD DVD, if – and inevitably when – Sony pulls the same trick Blu-ray it will create a 75GB disc and even its existing dual layer media has a 5GB advantage over HD DVD’s latest creation. That’s the problem facing Toshiba, NEC, and Sanyo (the prime movers and shakers behind HD DVD), Sony has a 10GB per side advantage over them so every time it adds a layer the difference gets even larger.

That said, I (and most of the civilised world) are still hoping the two will manage to copulate via some form of schoolyard romance and please everyone with an amicable amount of spit swapping.

Make Love Not War Multinationals.

HD DVD Consortium Group

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