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| Augmenting images with error correction data |
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| Walkthrough |
dvdisaster is specialized in working with error correction data and reading
of defective media. Creating ISO or UDF images and writing them to a medium
is a totally different business, and also bears high complexity.
We do not want to re-invent medium writing in dvdisaster. Instead we
continue using the CD/DVD/BD writing software which you have got when
purchasing your drive.
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First create an ISO image using your CD/DVD/BD
writing software. Select the files you want to write to medium,
but do not start the writing process yet. Instead, create an ISO
image on your hard disk. Click on the image to the left to see a
detailed walk-thorugh.
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Detailed example: Creating an ISO image on hard disk.
Since there are many different media writing programs available we
are demonstrating the required steps by using
the popular GNU/Linux software K3b as an example.
If you are using a different software you should be able to figure
out the required actions from the descriptions below.
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Begin a new project.
First open your media writing application. Many programs expect you to
start a new project. Within the project you will then make
the selections for the new medium.
Using K3b: Begin a new project by clicking into the highlighted field
("New Data CD project") in the main window.
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| Start new project |
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Select the files to be written on the medium.
Typically there is a file selection dialog from which you can select files
or drag them into the project.
Using K3b: Choose the required files in the upper half of the window.
In the example the files backup.tar.gz,
win.zip and work.tar.gz have been selected for writing onto CD.
The currently selected files are shown in the lower window half.
Important: Do not completely fill the medium. Make sure to keep
at least 20% of the medium space for the error correction data.
Using K3b: The currently used medium space is shown in the green bar
at the bottom of the window (558,9 MB).
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| File selection |
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Configuring the writing software. The software will let you
choose the writing target before the actual writing process is invoked.
Do not select the CD/DVD/BD writing drive here, but configure
the creation of an ISO/UDF image on hard disk as described below.
Hint: Remove all media from the drives before proceeding to make sure
that you do not inadvertently start the writing process.
Using K3b: Open the writing dialog tab by clicking on the "Burn" button
near to the left edge of the window.
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| Configuring the writing software |
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Selecting image writing. Most writing programs will simply let
you click an option for creating the ISO image on hard disk.
If your program seems to be missing this option you might have to select
an "image recorder" instead of the actual CD burner.
Using K3b: Select the "Writing" tab".
Activate the "Only create image" option (marked in green).
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| Selecting image creation |
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Select image file and type.
Select the target directory, name and type for the image file.
Use image files of type ".iso" or ".udf" only! Other image formats like
".nrg" are not supported by dvdisaster; processing such image files with
dvdisaster will render them unusable without further notice or error
messages.
Using K3b: Choose the "Image" tab.
Enter the target directory for the file
(the example file "medium.iso" will be put into the sub
directory "/var/tmp/cg"). K3b will always create .iso images so there
are no choices to be made for the image type.
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| Image file selection |
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When you have prepared the image
switch over to dvdisaster. Make sure that it
has been configured as described in
the basic settings.
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Select the directory and file name
of the ISO image which you have just created. |
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Augment the image with error correction data by
clicking on the "Create" button. |
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Please wait while the error correction data is created.
This may take a while depending on the image size and the
available free space on the medium. Processing a DVD image with about
20-30% free space should take about 5-10 minutes on recent hardware.
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Please note: dvdisaster does not create a new image, but will rather
augment the existing one. Look at the image in the file manager before
and after processing it with dvdisaster and note how its size increases.
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Write the augmented ISO image on the medium.
Select the augmented image in your writing software and
start the writing process. Click on the screen shot to the left for
a detailed example.
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Finished! You have now created a CD which is
protected by error correction code. |
Related information
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