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• #17 corlagon senior tag Flashy #16

  Új Válasz 2004-12-24 10:18:52 #17

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  corlagon

  senior tag

  válasz Flashy #16 üzenetére

  Itt a lényeg:
  
  Bővebben: link
  
  I call 'standard image' (this is a definition of mine, since images are absolutely non-standard: there are many many image types depending on the software you use to create them) an image WITHOUT ANY LEAD-IN /LEAD-OUT BYTES (Header) CREATED BY THE APPLICATION. THE IMAGE CONTAINS ONLY BINARY DATA EXTRACTED BY THE CD-ROM SECTORS.
  
  This mean that, in my definition:
  1) a RAW 'standard image' size (in bytes) is N*2352, where N (N<330,000) is the number of occupied sectors of the original CD. This was the original .RAW or .DAO format, now replaced by .BIN (CDRWin) or .IMG (CloneCD).
  2)a 'cooked' (data only) 'standard image' size of a PC CD-ROM (in bytes) is N*2048. This was the original .ISO (or .TAO) format. The .ISO extension is now abused, so you'll find .ISO images on the scene that do not compkly to the 2048*N rule.
  3) a 'standard image' size of an Audio CD is also N*2352
  
  Roxio EZCD and Nero, for instance, create NON STANDARD IMAGES, They add extra bytes on their .ISO/.NRG images so they cannot be read by other burning software. The image size (RAW or 'Cooked') created by such apps will not satisfy the 'golden rule' above described
  
  Please note that RAW size (2352) is incremented of 96 bytes/sector if you extract subchannel data (as CloneCD, BlindWrite and Alcohol 120% are capable of, for instance). Of course, extracting so much info is useful only if it's needed to copy extra info such as CD-text, protections etc.
  
  More, extracting much info is useless if your burner is not capable to write it back to the CD-R. For instance: if you want 1:1 copy the RAW image (2352 bytes) you have to write in 'RAW DAO' mode (raw disc-at-once) or the burner will re-calculate the ECC/EDC during burning, so spoiling the raw extraction.
  
  If you want to write also subchannel data, you need to write 'RAW DAO 96' (or DAO 96).
  
  CDRWin does not extract sub chanel info. The 2352*N bytes are put on the .BIN file. CloneCD puts the subchannel data on a .SUB file whose size is 96*N, and the RAW info on its .IMG file (that is 2352*N and, since it's standard, it matches 1:1 with CDRWin's .BIN). Alcohol ... I don't remember if it puts all info in an .MDF file, whose size is 2448*N, or creates a .SUB file too.
  
  ...
  
  2 éves cikk. 2352->2048, tényleg kidobja, de úgy veszem észre dobható nyugodtan, ha nincs másolásvédelem vagy több track/cd (ilyenkor amúgy a .nrg jó helyette).
  
  
  
  
  
  
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