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Starting Position of a Data CD Disk



 
 
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  #1  
Old February 27th 06, 02:38 PM posted to microsoft.public.win98.disks.general
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Default Starting Position of a Data CD Disk

Hi,

I have been told that a data cd (also audio cd) is
first "read" from the middle track. Another person told me
that it is first "read" from the inside track. I always thought
it was first read from the outside (near the edge) track.

Can someone, who really knows, tell me where the
first "reading" (when you insert a CD) takes place?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active key logger (spyware) in your PC.

  #2  
Old February 27th 06, 11:12 PM posted to microsoft.public.win98.disks.general
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Default Starting Position of a Data CD Disk

http://www.osta.org/technology/cdqa2.htm

What is the Orange Book?
Orange Book is the set of specifications created by Philips and Sony to
define the optical signal characteristics, physical arrangement, writing
methods and testing conditions for CD-R (Orange Book Part II) and CD-RW
(Orange Book Part III) discs. First released in 1990, Orange Book originally
dealt with only single speed CD-R recording but, with rapid advances since
made in hardware and media technology, the specification grew to include
CD-RW in 1996. Higher writing speeds continue to be incorporated as the
industry evolves.

What are the different sections of CD-R and CD-RW discs?
Orange Book organizes CD-R and CD-RW discs into various sections serving
distinct purposes. The Information Area is most fundamental and consists of
a shallow spiral groove (pregroove) extending from the discs' inside to
outside diameter. Encoded in the structure of this pregroove are speed
control and Absolute Time In Pregroove (ATIP) time code information as well
as other parameters critical for recorders to correctly write a disc.
Several regions within this pregroove are reserved exclusively for recorder
use.

The first is the Power Calibration Area (PCA), located in the inner portion
of the disc, which is employed while determining the correct power level for
the writing laser. Due to physical and practical design limitations on
rotational velocity it is, generally speaking, not possible to conduct power
calibrations at the inner diameter of the disc at speeds above 16x. A
process of extrapolation is therefore used to determine suitable writing
power for those higher speeds. Recently, Orange Book has designated the
addition of another PCA located in the Lead-Out Area at the outer portion of
the disc to provide the space necessary to conduct actual high speed write
power calibrations.

Following the first PCA is the Program Memory Area (PMA) which is used as
intermediate storage to record track information for all sessions written to
the disc. Typically, the PMA is first followed by the Lead-In Area,
containing table of contents information, followed by the Program Area which
holds the written data tracks and finally the Lead-Out Area which indicates
to a reading device that the end of the data has been reached.



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spybot http://security.kolla.de
AVG free antivirus http://www.grisoft.com
Etrust/Vet/CA.online Antivirus scan
http://www3.ca.com/securityadvisor/virusinfo/scan.aspx
Panda online AntiVirus scan http://www.activescan.com
Panda online AntiSpyware Scan
http://www.pandasoftware.com/virus_info/spyware/test/
Catalog of removal tools (1)
http://www.pandasoftware.com/download/utilities/
Catalog of removal tools (2)
http://www3.ca.com/securityadvisor/n...aspx?CID=40387
Trouble Shooting guide to Windows http://mvps.org/winhelp2002/
Blocking Unwanted Parasites with a Hosts file
http://mvps.org/winhelp2002/hosts.htm
links provided as a courtesy, read all instructions on the pages before
use
Grateful thanks to the authors/webmasters
_
"Brad" wrote in message
...
Hi,

I have been told that a data cd (also audio cd) is
first "read" from the middle track. Another person told me
that it is first "read" from the inside track. I always thought
it was first read from the outside (near the edge) track.

Can someone, who really knows, tell me where the
first "reading" (when you insert a CD) takes place?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active key logger (spyware) in your PC.



 




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