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Blu-ray means more memory

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Hitachi is better known for gadgets other than camcorders. But the company is one of the big names behind the new data storage technology, the Blu-ray Disc.

So it's no surprise that Hitachi has released the DZ-BD70 and the DZ-BD7H camcorders, bringing the Blu-ray Disc technology to camcorders for the first time.

Both models come equipped with a Blu-ray Disc drive capable of supporting the new high-capacity discs, while the BD7H boasts an extra 30GB hard disk drive.

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So what's the big deal?

With a Blu-ray Disc, you get nearly 10 times the capacity of a DVD on a disc of the same physical size.

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By replacing the 'red' lasers used in conventional DVD and CD players, Blu-ray uses a laser in the 'blue' light spectrum, which has a shorter wavelength, allowing a larger capacity on a single disc surface.

The result is a disc that can hold 25GB of data on a single layer disc and 50GB on a dual layer disc.

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