The blue period of lasers
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| Posted by | Robin van Lieshout |
| Posted on | 27/07/02 20:18 |
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Land Ho!Next to the grooves, there are lands. Lands are the borders between the grooves. Taken a closer look you could think of that the lands are the mountains that separate the grooves from each other.
On a DVD-RW, DVD+RW or a BD (Blu-Ray Disc, remember?) the grooves and lands also are not straight. They have a sinus form. This is called a wobbled groove.
As you can see from the above picture, the groove holds the data (notice the little black pits) and the lands separate all the grooves from each other.
As you might think already, this will take a very precise method of reading and writing the data. Then why this very complicated pattern of writing and reading? The answer is simple: It's very durable. The data is written ONLY on the grooves and the lands NEVER change. So the laser always knows where to look at.
(Pictures courtesy of http://www.optodisc.com/tech_info02.html)
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Posted by nEXusJ on Wednesday 31 July 2002 03:33
Cool post, Mr. Belvedere. 
Great info on the BD. So, when's the expo on the 130GB CD3?
Later,
nEXusJ
Great info on the BD. So, when's the expo on the 130GB CD3?
Later,
nEXusJ
Posted by dansmug on Thursday 01 August 2002 22:30
I thought there were so little reactions, I felt compassion with Mr. Belvedere. So once again: nice article.
Ok. Great article... but... Why are they using MPEG2? We live in a world where MPEG4 has taken over(divx). All they need to do is creat a MPEG4 for super high resolutions(1080p).
Same with audio. By that time we will have DD10.2 or something like it. Audio should be encoded in WMA8(divx audio) or MP3PRO.
Same with audio. By that time we will have DD10.2 or something like it. Audio should be encoded in WMA8(divx audio) or MP3PRO.
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