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Discussion in 'OS X Mountain Lion (10.8)' started by TSX, Jan 15, 2013.
I want to zero out my HD and I'm in mountain lion. How do I go about doing this?
Put ML on a USB flash (8GB), boot from USB (option key) and do a secure erase.
So a secure erase is an option in disk utility im guessing?
Yep, Erase, Security Options.
It'll take awhile...
This is going to take a long time, be ready to twiddle your thumbs.
I'm in no rush but thanks for the replys.
Couldn't you just boot into recovery-mode (command-R) to get to Disk Utility? Thus, no need to create a bootable flash.
1 pass,3 pass or 7 pass? And how long will it take for a 1 TB drive.
It depends on which type of security you want to implement. If you really want to make sure the data is never recovered ever use the 7 pass option.
Long enough to grow weary and cancel the erasure about 1/3rd through.
Why would this be necessary? Doesn't Disk Utilitity take care of this for you?
A Zero pass on a 120GB drive takes about a hour at USB2 speeds (33MB/s). A good 1TB HDD today can hit about 130MB/s. So best case is about 2 hours, worst case 8 1/2.
While it might have been true sometime in the 70's/80's, it's in no way true today. The density of today's hard disks prevent any recovery after the drive has been Zeroed.
For a HDD all you need to do is a single Zero pass, anything more and your wasting your time. SSD's on the other hand need to have the Secure Erase ATA command sent to them (and this only works if the SSD manufacturer implemented it correctly).
Didn't know about that. Thanks for the heads up
There's a lot of mis-information spread about the internet on erasing hard drives and recovery of the data. If you have the time, do a Google search for "zeroed hard drive recovery".
Will do! I was talking mostly based on what OSX itself says (or said?) when describing the different security options available.