Error in DICF image of a CD-R disc #267

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claunia · 2026-01-29T15:14:42Z

claunia commented

2026-01-29 15:14:42 +00:00

Originally created by @TheRogueArchivist on GitHub (Aug 27, 2019).

Prerequisites

Are you running the latest version?
Can you reproduce the problem in the debug version?

Check and fill as appropiate:

I was running DiscImageChef under Windows 7...
...in 32-bit

Description

A DICF image of a CD-R disc has 2 errors according to verify, even though the log never stated that any sectors were unable to be read. Also miscompares with an MDS image from A120% with the message "Sector 1874 is different".

Image files: https://drive.google.com/file/d/1mPVWYaSEmgKpZeMi_BmiMePYCuMYVZfC/view?usp=sharing

Also fails on another drive on a different sector, the new image has the error "Checking sector 3072 of 79612, on track 1DEBUG (CD checksums): Mode 1 sector at address: 00:45:51, fails ECC Q check" in verify -v -d.

Third dump returns no errors using the same drive as the first dump, seems like both drives may not return all errors.

Exact command line used:

dotnet .\DiscImageChef.dll verify ".\PCW10ED.dicf"

Output of command execution with debug output enabled

iscImageChef 4.5.99.1693-00000000 built by DESKTOP-8B4K7NM in Debug
Copyright c 2011-2019 Natalia Portillo

Uploading statistics
Disc image checksums are correct
All sector checksums are correct
Total sectors........... 79612
Total errors............ 2
Total unknowns.......... 0
Total errors+unknowns... 2

Originally created by @TheRogueArchivist on GitHub (Aug 27, 2019). ### Prerequisites * [X] Are you running the latest version? * [X] Can you reproduce the problem in the debug version? ### Check and fill as appropiate: * [X] I was running DiscImageChef under Windows 7... * [X] ...in 32-bit ### Description A DICF image of a CD-R disc has 2 errors according to verify, even though the log never stated that any sectors were unable to be read. Also miscompares with an MDS image from A120% with the message "Sector 1874 is different". Image files: https://drive.google.com/file/d/1mPVWYaSEmgKpZeMi_BmiMePYCuMYVZfC/view?usp=sharing Also fails on another drive on a different sector, the new image has the error "Checking sector 3072 of 79612, on track 1DEBUG (CD checksums): Mode 1 sector at address: 00:45:51, fails ECC Q check" in verify -v -d. Third dump returns no errors using the same drive as the first dump, seems like both drives may not return all errors. ### Exact command line used: dotnet .\DiscImageChef.dll verify ".\PCW10ED.dicf" ### Output of command execution with debug output enabled ``` iscImageChef 4.5.99.1693-00000000 built by DESKTOP-8B4K7NM in Debug Copyright c 2011-2019 Natalia Portillo Uploading statistics Disc image checksums are correct All sector checksums are correct Total sectors........... 79612 Total errors............ 2 Total unknowns.......... 0 Total errors+unknowns... 2 ```

claunia added the bug label 2026-01-29 15:14:42 +00:00

claunia commented

2026-01-29 15:14:43 +00:00

@claunia commented on GitHub (Dec 7, 2019):

Add option to auto correct CD sectors when some part of EDC/ECC passes and other fails.

@claunia commented on GitHub (Dec 7, 2019): ![](https://github.trello.services/images/mini-trello-icon.png) [Add option to auto correct CD sectors when some part of EDC/ECC passes and other fails.](https://trello.com/c/7DUwKzJy/12-add-option-to-auto-correct-cd-sectors-when-some-part-of-edc-ecc-passes-and-other-fails)

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Reference: aaru-dps/Aaru-aaru-dps#267