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Sony already have a MD2 technology, which is something like 600MB AFAIR. So there
seems no need to invent a new media. Instead, I believe Sony should bring out
something like "SAMD" which can do quality comparable SACD then it will be cool. And
might boost the sales of both products too..
Raymond
>
>Alan Dowds wrote:
>>
>> Just a thought.
>>
>> Why didn't Sony make MD double sided? Could have followed the analogue
>> cassette analogy (!) and given twice the recording time for almost the same
>> cost?
>
>MD is like CD. The active layer is on the top of the disc, and the disc
>itself is optically clear. The laser shines through the disc and hits
>the top layer from below. MD is also MO technology and during
>recording, the laser heats the active layer to its Curie point while a
>magnetic head sits directly above the laser and polarizes the active
>layer appropriately. I believe for MO to work, a magnetic head has to
>be directly above the laser. At any rate, this would prevent the
>ability of MD to be a dual-sided media.
>
>Now perhaps using CD-RW technology (phase change?), it could be
>double-sided. However, this would require the active layer to be
>sandwiched in the middle. Not to mention this adds complexity in that
>there would need to be dual optical pickups on both sides of the disc to
>read each side. This is far simpler in magnetic media (like 3.5"
>floppies and hard drives) where the heads are tiny, but in an optical
>media, the optical blocks are very large. I think a dual-sided portable
>player would be extremely large.
>
>Now if MD were double-sided and required flipping the disc (like
>non-autoreverse cassette players)... I think that would just suck!
>Flipping discs would be very annoying!
>
>Shawn
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