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The groove can't be tightened without rendering the disc incompatible with
existing equipment - the gap between grooves on 80-minute discs are already
at the lower limit of what Sony says MD equipments should be able to handle.
A way of getting 90 minutes (or more?) would be to use an 80-minute disc and
spin it at a lower speed. However, it seems that we don't have materials
that would have the physical properties necessary to allow that.
Leon
on 3/11/01 11:22 PM, Simon Mackay at [EMAIL PROTECTED] wrote:
>
> Hi everyone!
>
> Is it possible within the MD standard to make discs that go longer than 80
> minutes in SP mode by tightening the "pre-groove" spiral on the disc? This
> could be interesting because I have heard a rumour being passed amongst
> retailers that there could be 90-minute MDs on the market.
>
> If the rumour proves true and someone starts to manufacture 90-minute MDs,
> you could have discs that go for 3 hours in mono or LP2 stereo or 6 hours in
> LP4 joint stereo. This would be enough to threaten Audio CD-R and most
> solid-state MP3-carrying media.
>
> With regards,
>
> Simon Mackay
>
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