Best way to Safely Delete Hard Drive for Sale.

Traverse

macrumors 604
Original poster
Mar 11, 2013
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Hi,

I have an external hard drive that I no longer need and I can get fifty dollars for it. I used it for time Machine backups and I "restored" it so it has like 499 GB free (I just used the quickest setting in Disk utility), but I wan't to make sure the drive is clear and my information is safe.

What is the best way to complete clear a HDD?
 

ColdCase

macrumors 68030
Feb 10, 2008
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You use disk utility to erase, under security options is a slider to select how secure to erase, from none to write over 7 times. If its a friend, just a reformat may be good enough.

Then reformat.
 

Traverse

macrumors 604
Original poster
Mar 11, 2013
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You use disk utility to erase, under security options is a slider to select how secure to erase, from none to write over 7 times.

Reformat.
Thanks, that's what I figured, do you feel that 7 is necessary?
 

ColdCase

macrumors 68030
Feb 10, 2008
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Depends on how well you know the person you are selling to and how valuable the data is. Overwrite once or twice should be good for typical data.
 

Traverse

macrumors 604
Original poster
Mar 11, 2013
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Depends on how well you know the person you are selling to and how valuable the data is. Overwrite once or twice should be good for typical data.
I don't know the person, so I'll probably use the max. Thanks!
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
29,297
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California
Hi,

I have an external hard drive that I no longer need and I can get fifty dollars for it. I used it for time Machine backups and I "restored" it so it has like 499 GB free (I just used the quickest setting in Disk utility), but I wan't to make sure the drive is clear and my information is safe.

What is the best way to complete clear a HDD?
Attach the drive then right click it in Finder and select encrypt. Then go to Disk Util and select the drive brand name at the top (not just the partition) and erase it. Any data on there is gone forever. Even if someone managed to restore what you deleted it would be encrypted.