How to erase data from a Multi-Session CD???

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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
 
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go4saket

go4saket

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@i_kill : Thanks for your explanation, but we all arw aware of this. BTW, we are actually talking about CD-R and not CD-RW. Moreover, after a full format in CD-RW, data can still be recovered by using data recovery softwares that recovers data using sector by sector reading. That is the way thing happen in HDD. Formating just removes the FAT and not the actual data.
 
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The links are broken in "quick format" whereas the disc is actually erased in "full format", or may be it was just the Isobuster which was unable to recover the data.
Don't you think, trying to "protect" your data on a CD-R will make it useless. And when its useless then why keep it?
 
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