Decision help

dvdisaster Version 0.72.4 / 0.72 (pl4) | To the Internet version

Contents
News
Overview
Howtos
· | The big picture
· | Scanning media for errors
· | Putting error correction data on a separate file
| - | Decision help
| - | Basic settings for reading
| - | Creating the error correction file
| - | Archiving error correction files
| - | Advanced settings
· | Putting error correction data on the medium
· | Recovering media images
· | Getting information about images and error correction data
· | Testing image compatibility
· | Dialogs and buttons
Download
Questions and Answers
Bug reporting
Creating error correction data |
Decision help
### Decision help Error correction data can be either created in form of a separate error correction file or it can be placed directly onto the medium. Click on the answers to the following questions to find out which method is most appropriate for you. Do you need error correction data for a medium which already exists? Yes, the medium has already been written. No, but I am planning to write the medium now. How many free space is left on the medium? The medium has more then 20% free space left. The medium is full or nearly full (less then 20% free) There is not enough space left on the medium for storing the error correction data. You must create a separate error correction file. ### More information on keeping error correction data dvdisaster helps protecting your media from data loss by forehanded*) creation of error correction data. Error correction data must be treated like normal backup data, e.g. you need to keep it available during the whole lifetime of the respective medium. The easiest way is storing the error correction data on the medium you want to protect. But this is only possible if the medium has not yet been written: To employ this method you need to create an ISO image first, then augment this image with error correction data, and finally write the augmented image to the medium. If the medium has already been written, or insufficient space is left for augmenting the image, you still can create error correction data in form of a free-standing error correction file. This file must then be stored somewhere else, e.g. you need to take additional provisions to archive your error correction files. More information about the pro and con of these methods can be found in the background information section.
*)Let's repeat again for clarity: Error correction data must be created before the medium becomes defective. It is not possible to create error correction data from defective media; in that case unreadable sectors can not be recovered.

Copyright 2004-2012 Carsten Gnörlich. Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.