How to destroy data CD-R?

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Breaking them into a few pieces is going to be more than enough to prevent any "normal" person from reading them with over the counter equipment.

I'm sure the NSA could find a way to read the pieces and extract at least some of the information if they had to though :)
 
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Yes, it all depends on how hard someone wants to try. A fold or two will stop all but the most determined and skilled. Unless there are state secrets or some treasure involved, no one is going to the trouble for typical backups.

When you break them, the coating usually peels off anyway.
 
If you make a small cut on the back side, you can remove the entire reflective layer with tape, leaving a (mostly) clear disc. Leaving this in the sun or breaking/cutting/shredding it will surely stop anyone from getting your data.

If a CD/RW, you can probably DBAN it.
 
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I wouldn't underestimate are Big Brother, industrial spies, and identity thieves.
 

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