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I have an old Mac that I want to sell. I have the 2 instalation disks but don't know what to do with them.

OS X version 10.5.8
Processor: 2.8 GHz Intel Core 2 Duo
Startup Disk: Macintosh HD

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Non-paranoid - boot from installation CD, use Disk Utility to format the disk(s), perhaps using "secure erase" option (let it run overnight, it's tedious on a disk of any size) install fresh copy of the OS from the CDs, sell the computer.

Reasonably Paranoid - remove disks, sell computer without disks. Disassemble disks. Be sure to save the very nice refrigerator magnets. Scratch, bend, hammer and otherwise destroy the nice mirrors in there (though simply opening them outside a clean room puts the data past most anyone but the NSA - this is the paranoid option, so overdoing works.)

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+1 for non-paranoid vs. reasonably paranoid. :D – thankyour May 6 '14 at 12:07

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