dvdisaster Version 0.72 (pl3) | To the Internet version

Contents

News
Overview
Howtos
· | The big picture
· | Scanning media for errors
· | Putting error correction data on a separate file
· | Putting error correction data on the medium
· | Recovering media images
· | Getting information about images and error correction data
| - | Show information
| - | Results for error correction files
| - | Results für augmented images
| - | Examples
· | Testing image compatibility
· | Dialogs and buttons
Download
Questions and Answers
Bug reporting

### Examples

You have already seen examples of good images and error correction files and good images augmented with error correction data on the previous pages. In the following some typical examples of error situations are presented:

Here are two typical cases of showing information for images which have not yet been fully recovered:

Image with unreadable sectors and error correction file. The image shown here contains 6245 unreadable sectors; error correction data is present by means of an error correction file.

Image with unreadable sectors, RS01

Image augmented with error correction data, containing unreadable sectors. This image contains unreadable sectors towards its end. Especially the ECC section is affected since the error correction data is located at the end of the image. Please note that this does not weaken the error correction since its corrective power is independent from the error location: 10000 errors at the beginning of the medium are just as easy to correct as 10000 errors towards its end.
The RS02 encoder which was used for creating the error correction data is capable of predicting the odds of a successful image recovery. These are shown at the end of the error correction data output area.

Screen shot: Image with unreadable sectors, RS02

Image from aborted reading process. This image is shorter than expected; this usually happens when the reading process is stopped prematurely.

Aborted read

Image is larger than expected. This image is larger than expected; possible causes are discussed in the section about image compatibility. It may be possible to recover from this problem; see hints related to using error correction files and using augmented images.

Image too large

Wrong error correction file. The error correction file was created for a different image. This causes lots of CRC errors since the sectors have different contents. However the most important hint is:

Fingerprint: mismatch

This tells you that the error correction file does not belong to the image.

Wrong error correction file

Old documentation (V0.70)

Copyright 2004-2011 Carsten Gnörlich. Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.