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Deleting personal information

My dad is thinking about selling his iMac, we are concerned about the personal info it contains not least online banking stuff. How can I be sure all the info has been permanently deleted ? Is there a way of doing this or is it always at risk of being recovered ?
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There are several ways of doing it, it depends how paranoid you are. (sorry, I don't want to sound like I'm accusing you of being paranoid, just that people have different levels of risk)

1. Delete browser history.
2. Use CCleaner to remove the data CCleaner for Mac OS X
3. Delete all document folders, then do a reinstall (Command + R at bootup), followed by using CCLeaner to wipe free space
4. Remove & destroy the hard disk

You can do any, or all of those. Personally, I have used options 2 and 3.
The final thing you can do, no matter which option you choose, is to change the password on your bank account after you've sold the computer.

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Cleaning internet and deleting files dont work.. You can get apps that will search your hard-drive and it will dig up things you deleted ages ago.
wiping your hard-drive completely and rebooting is the best option and what i personally do.
CCleaner is a good shout as it has drive wiper
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Aren't multi drive wipes recommended?
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I'd ensure that you balanced your paranoia with your buyer.

If you are selling it privately in the local rag and a dad arrives with his teenage daughter who wants to put it in her bedroom and use it for flirting on face berk then you are probably safe to just do a big old mass delete and changing your critical passwords.

If you are sticking it on Ebay and posting it to someone who you have no idea who they are - I'd be drilling holes in the hard disk.....
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(Post Link) post #7 of 14 Old 10-04-13 Thread Starter
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Paranoia scale of 1 to 10, 1 = Don't care really. 10 = they're after me I know they are. I think probably 9

Thanks for all the info
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replace the hard-drive and burn the old one
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Quote:
Originally Posted by AlfaDrivingFan View Post
Paranoia scale of 1 to 10, 1 = Don't care really. 10 = they're after me I know they are. I think probably 9
In which case;

Screwdriver the HDD
Shred the 'puter
Torch the house
Dump & torch the MiTo
Bin your passport
Assume a fake identity
Move to Mongolia

H2H.
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When I worked at BAE Systems, the discs were destroyed with shredders/fire. Anything else is a risk.

Personally unless you have pictures of you or your missus or Mum and Dad in the buff, I'd just reformat and install the OS again, Having never used a Mac I would only know about reformatting (I am a UNIX/Linux admin).
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(Post Link) post #11 of 14 Old 13-04-13 Thread Starter
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Quote:
Originally Posted by Keithy View Post
In which case;

Screwdriver the HDD
Shred the 'puter
Torch the house
Dump & torch the MiTo
Bin your passport
Assume a fake identity
Move to Mongolia

H2H.

That's what I did last time !
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Quote:
Originally Posted by MalcQV View Post
Having never used a Mac I would only know about reformatting (I am a UNIX/Linux admin).
Mac OS is derived from BSD with a proprietary file system so you know mre than you think...
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I use old hard drives for target practice. Once they've had a few rounds through them, no one is getting the data off them...
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Quote:
Originally Posted by GhostyDog View Post
Mac OS is derived from BSD with a proprietary file system so you know mre than you think...
I'm aware, but I never like to comment on (seriously) anything I don't have first hand experience when talking IT
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