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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
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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. -- - Adaware http://www.lavasoft.de 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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