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According to the Blu-ray Disc specification, 1x speed is defined
as 36Mbps. However, as BD-ROM movies will require a 54Mbps data
transfer rate the minimum speed we're expecting to see is 2x
(72Mbps). Blu-ray also has the potential for much higher speeds,
as a result of the larger numerical aperture (NA) adopted by Blu-ray
Disc. The large NA value effectively means that Blu-ray will
require less recording power and lower disc rotation speed than
DVD and HD-DVD to achieve the same data transfer rate. While the
media itself limited the recording speed in the past, the only
limiting factor for Blu-ray is the capacity of the hardware. If
we assume a maximum disc rotation speed of 10,000 RPM, then 12x
at the outer diameter should be possible (about 400Mbps). This
is why the Blu-ray Disc Association (BDA) already has plans to
raise the speed to 8x (288Mbps) or more in the future. |
