How does data get corrupt from scratches?
There is a metal layer inside the plastic layer on the CD/DVD. The data is stored in the metal layer that appears to be golden or silver. The transparent plastic layer protects the metallic layer from scratches and the dust. Most of the time the scratches on CD/DVD are not deep enough and if tooth paste being applied on to it these scratches vanish. But the scratches those are deep cause the problem.
The scratches on the plastic layer tend to collect the dust in to it and when the layer tries to read the data from the CD/DVD dust doesn't allow it to do so. Which causes the read error.
Is this the only symptom or the problem due to which the data gets corrupt in a CD/DVD? No, it isn't the case.
Symptoms of a corrupt CD/DVD
If the data is not accessible from the disk but the disk indicate that it's full.
If the files or the directory can be seen but you are not able to access it on any other media.
If you get a error message saying” file does not exist”
If the operating system shuts down while you are in mid of writing a CD, can cause cd errors.
If you insert a CD/DVD in to the drive and it makes loud whirring noise.
If the computer freezes while trying to read a CD/DVD
If you know that the CD has the data but on accessing it shows the CD is blank.
Not to mention physical damages like scratches, bubbles and cracks.
If you get across any of the above mentioned symptom or problem its a alarm for you that your precious data is under a huge danger. What can rescue is the CD/DVD data recovery software. These software are quite effective as they recover data which are recorded using ISO 9660 or ISO 9660:1999, data burnt on Windows, Mac, Linux, and Unix. Hope so that you find the information useful and next time you can recover the data if the CD/DVD gets corrupt