Erase mac hd without disc

How to Securely Erase Data from Your Mac and External Drives
Contents:


  1. The ultimate checklist before you reset MacBook Pro
  2. How to Reformat Mac OS X Without a Recovery Disc or Drive « Mac Tips :: Gadget Hacks
  3. How to reinstall macOS from macOS Recovery

Some people say that the standard erasing of an SSD makes data recovery hard enough for it to be "secure. Technology such as wear leveling , which tries to ensure each memory block on an SSD is used the same amount of times, can really mess with a secure erase.

How to Reformat your Mac without a Recovery Disk!

If we can't be confident an SSD was properly erased, then there is only one route to take that will ensure all data is beyond the reach of anyone: Using encryption. By using FileVault to encrypt the drive startup drive and Disk Utility to encrypt external drives, all the data on the drive will be garbled, unless someone has the encryption key your password. Now, when it comes time to part with your drive, all you have to do is a basic erase in Disk Utility.

This will delete your encryption key, leaving nothing but garbled data on the drive.

The ultimate checklist before you reset MacBook Pro

Without a way to decrypt the garble, even if all of it is recovered, it will be useless. Of course, you can apply this to hard drives as well, but as those have actual secure erase options available, it's better to use those. If you are unable to mount the drive, whether it's a hard drive or solid state drive, tools like Disk Utility won't help you. You might think that if you can't access it, neither will someone else. Unfortunately, this is not the case.

While a dumpster diver won't go through the trouble of repairing the drive, someone with more time, deeper pockets and more motivation certainly can. Hard drive platters can be extracted from the drive enclosure and read out using specialized equipment.

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How to Reformat Mac OS X Without a Recovery Disc or Drive « Mac Tips :: Gadget Hacks

For drives that are not accessible, there is only one option to ensure the data is unrecoverable: Smash it to bits. Professional data recovery companies can extract data from drives that were under water for long periods of time—or even in a serious fire. Smashing a hard drive with a sledgehammer or baseball bat is strangely satisfying too, but unless you open the enclosure to make sure the platters or chips are pulverized, even a few well-placed hits may not be enough to destroy your data.

Of course, there is also a health hazard with debris flying around. So take precaution with this fun, albeit super destructive, method to securely erase data. A professional service that uses hard drive shredders is a safer and probably more effective option.


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That said, if you think you can do better than this , or if a professional service is not in your budget, or if you simply believe smashing it with a hammer is more satisfying, have at it! Just make sure you take the necessary safety precautions. Either way, with these methods you can be sure your data does not end up in the wrong hands.


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The last option hammer time is what IRS administrators used — for details and time saving tips just ask retired, bonus award winner Lois Lerner. Follow IntegoSecurity. The Mac Security Blog. Thankfully, getting everything wiped and back to its original state isn't too complicated or painful a procedure any more. Here's how to go about it in the latest Mac OS X. Restoring your computer back to its original state, whether on Windows or Mac, is a whole lot easier than it used to be—restore partitions original copies of the OS integrated into your laptop , downloadable software and automatic backups mean the process is no longer as hair-pullingly frustrating as it was five or ten years ago.

Reinstall from macOS Recovery

That said, you are wiping everything off your machine: Make sure all your photos, music, apps and so on are backed up somewhere else, because you're going to be starting again from scratch. Where are your emails? Where's your iTunes library?

How to reinstall macOS from macOS Recovery

Check once and then check again to make sure you can get everything back again. Make sure to deauthorize any apps—such as iTunes or Photoshop—that you're going to download afresh, because your newly wiped computer is going to be viewed as a new machine.

Dropbox finished syncing? Power cable attached? Pictures of the kids somewhere safe? Then you may proceed. Click on Disk Utility then Continue first of all to get your Mac's hard drive wiped.