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Wipe Out Old Data Before Retiring Your Mac E-mail
If your old Mac's hard drive contains sensitive data such as financial records or confidential business information, you can use an option on Disk Utility's Erase screen (click the Options button) to write zeros over all the sectors of the hard disk, ensuring that no future owner will be able to resurrect your data.

 

Excerpted from Take Control of Buying a Mac by Adam C. Engst

 
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