Learn more about deauthorizing your computer using iTunes , including how to deauthorize all the computers you've used with your iTunes account.
Sign out of iTunes Open iTunes. Security Option 4 is the most secure, but it is also widely believed to be a waste of time and electricity.
Start a Discussion in Apple Support Communities. Release the keys when you see the Apple logo, a spinning globe, or a prompt for a firmware password. Yes No.
Are you formatting the disk that came built into your Mac? You received a message that your disk isn't readable by this computer. Professional data recovery companies can extract data from drives that were under water for long periods of time—or even in a serious fire.
Of course, there is also a health hazard with debris flying around. Even though all new Macs these days come with Flash storage which I'll cover later , there are still plenty of hard drives around and in use today. Will you be using the disk with another Mac?
Personally, I always go with option 2, but if you want to feel more confident your data is securely erased, or if you must comply with company rules, use option 3 or 4. You probably don't need to erase, unless you're selling or giving away your Mac or have an issue that requires you to erase. After all, securely erasing your data ensures your personal and private information does not end up being found and abused by someone else.
For help creating a bootable external drive, have a look at Apple's page here , or use a popular tool such as DiskMaker X. If the disk is external, leave it connected, but make sure that it's turned on and connected directly to your Mac using a good cable. Which format: Whether your Mac is used to store school work, projects at work, personal files or just used for browsing the web, information from that Mac is valuable to someone other than you.
Odds are everyone does these things.