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@go4saket: I hope you're talking of CD-RW. Then the simplest way to *ahem* "protect" your data is to do a full format (it will take around 25 mins) and then burn some scrap data (optional). I do have IsoBuster and it can NOT recover after a full format. The reason that it is able to recover after a quick format is that a quick format does not earase the data infact it just breaks the links to this data thus making it useless. (Ever wondered why deleting a file takes far lesser time than writing the same on HDD, the same concept is applied there). In case you are talking of CD-R then sorry buddy you can not do anything to "protect" your data and the best way will be to dispose off that disc.
@others: There's a difference between CD-R and CD-RW. Data is written on CD-R by burning permanent grooves in the plastic, on the other hand a CD-RW disc contains a phase-change alloy recording layer composed of a phase change material, this material is "crystallized" or "annealed" to result in what is known as 'buring' and 'erasing'. Hence you can "shred" data from a CD-RW but not from CD-R
PS: CD means CD/DVD
@others: There's a difference between CD-R and CD-RW. Data is written on CD-R by burning permanent grooves in the plastic, on the other hand a CD-RW disc contains a phase-change alloy recording layer composed of a phase change material, this material is "crystallized" or "annealed" to result in what is known as 'buring' and 'erasing'. Hence you can "shred" data from a CD-RW but not from CD-R
PS: CD means CD/DVD