I read that it is certainly possible, but so far the magneto-optical
material hasn't been capable to achieve some of the properties needed.
I'm not sure about the technical details, but it seems to be something about
the magnetic power of the material. If you drop speed more, more data is
being squeezed into the same space, so the material has to be more
sensitive. This was also the reason for the 74-min disc launching months
after the original 60-min disc. Work still has to be done to make the
material usable in 80-minute+ context.
The size of groove on 80-minute Discs (1.4um I think) is as low as current
equipments will accept (format standard is 1.5um +- 0.1um), so to cram in
more time you'll have to reduce disc speed.
Correct me if I'm wrong. :)
Leon
> From: Jeanmougin <[EMAIL PROTECTED]>
> 60 minutes MD spins at 1,4 m/s linear.
> 74 minutes MD spins at 1,2 m/s linear.
> 80 minutes MD has the same linear speed than 74 minutes MD and thinner
> groove to increase the capacity.
>
> So, is it possible to make MD with a groove as thin as MD 80's but with
> a slower linear speed to increase the recording capacity (why not MD 90
> or 100 minutes of stereo recording?)
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