Dumping CD-Rs with Errors in the Last 2 Sectors

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Many '''CD-Rs have Errors in their Last 2 Sectors''' due to how the discs were "mastered". These dumps are usually not bad, but require extra steps to ensure QC when adding to redump.
Many '''CD-Rs have Errors in their Last 2 Sectors''' due to how the discs were "mastered". These dumps are usually not bad, but require extra steps to ensure QC when adding to redump.
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This guide is only for CD-R discs which give errors at the end of dumping. If your dump does not have an error with /c2 enabled then you don't need to follow this guide.
==Steps==
==Steps==
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* Dump your CD-R with MPF/DiscImageCreator. If there are no errors, a .bin file will be created and your dump is good. If you had errors at the end of the dump, dump the disc a second time.
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* Dump your disc to confirm it is getting c2 errors at the end.
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* Compare the hashes of your first and second dumps, if they match then your dump is good and you can submit it normally and stop at this point.  
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* Redump your disc multiple times WITHOUT the /c2 flag. If your bin files match from two dumps, then your results are good. Note: You may need to dump more than twice to get matching results.
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* Otherwise, dump it a couple more times to see if you can get matching hashes - if you can't get matching hashes then more investigation is required.
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* When you have two dumps with matching hashes, keep one of the dumps and delete the others.
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* Launch [https://archive.org/download/descramble-cdda/Descramble_CDDA.exe Descrambler_CDDA.exe] and under "Input cdda 2352 per sector file:" select the three "..." button to find your .scm file. Click "Unscramble".
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* Now you have a good disc image ready for adding to Redump.
* Now you have a good disc image ready for adding to Redump.
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==Adding to Redump==
 
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In addition to the normal submission steps, you'll need to do the following.
 
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* Get the hashes & file size of the file.
 
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* Figure out what Mode the CD-Rom cue should be.
 
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** Download [https://archive.org/download/CDmage/CDmage.exe CDmage] -> right click -> "Run as administrator".
 
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** File -> Open -> select your .bin file -> "Open"
 
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** Now you can select the "Mode" in which you can open the disc image. Select "M1", if you get an error "Invalid format of the file...", that means your disc is NOT Mode 1. Now try again with "M2" (Mode 2), your disc should mount.
 
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** During submission, mention which Mode your disc is. This will be necessary for adding to the cue file.
 
* Copy + paste the link to this guide in your submission to the Mod adding your disc will have context.
* Copy + paste the link to this guide in your submission to the Mod adding your disc will have context.
[[Category:Dumping Guides]]
[[Category:Dumping Guides]]

Revision as of 20:14, 5 August 2022

Many CD-Rs have Errors in their Last 2 Sectors due to how the discs were "mastered". These dumps are usually not bad, but require extra steps to ensure QC when adding to redump.

This guide is only for CD-R discs which give errors at the end of dumping. If your dump does not have an error with /c2 enabled then you don't need to follow this guide.

Steps

  • Dump your disc to confirm it is getting c2 errors at the end.
  • Redump your disc multiple times WITHOUT the /c2 flag. If your bin files match from two dumps, then your results are good. Note: You may need to dump more than twice to get matching results.
  • Now you have a good disc image ready for adding to Redump.
  • Copy + paste the link to this guide in your submission to the Mod adding your disc will have context.
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