How to format mac hard drive without disk utility

It erases the volume's data by writing over it with zeros. The length of time this method takes depends on the size of the volume. This method meets the security requirements of the U. Department of Defense's M standards for erasing magnetic media.


  • Disk Utility erases, formats, repairs, and partition hard drives and SSDs.
  • Erase or Format Your Mac's Drives Using Disk Utility!
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This is the highest level of data erase security that Disk Utility supports. It writes over the data on a volume 35 times. Don't expect this erase method to finish any time soon.


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  8. The slider options are: This is the quickest erase method. It doesn't scramble the file data, which means a recovery app may be able to resurrect the erased data. Zero Out the Data. This erase method writes a single path of zeros to all locations on the selected volume or disk. Advanced recovery techniques could restore the data, but it would require a great deal of time and effort. This is a DOE compliant three-pass secure erase. It writes two passes of random data to the volume or disk and then writes a single pass of a known data pattern to the volume or disk.

    Most Secure. This method of securely erasing a volume or disk meets the requirements of the U. The erased volume is written to seven times to ensure the data can't be restored. Make your selection and click the OK button to close the Security Options. This formatting process takes a little longer than the basic erase method described previously. Select a drive from the list of drives and volumes shown in Disk Utility.

    Each drive in the list displays its capacity, manufacturer, and product name, such as Enter a name for the drive. The default name is Untitled. The Volume Format drop-down menu lists the available drive formats that the Mac supports. Optionally, select Zero Out Data. This option is for hard drives only and should not be used with SSDs. Where are your emails? Where's your iTunes library? Check once and then check again to make sure you can get everything back again.

    Reinstall from macOS Recovery

    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?


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    Then you may proceed. Click on Disk Utility then Continue first of all to get your Mac's hard drive wiped. I backed up my files and was already to go and restarted twice and could not get this menu to come up Is this not possible on Snow Leopard? This only works for Lion and higher. If my computer originally came with Snow Leopard but has since been upgraded to Mavericks, will I be able to do the factory reset back to Mavericks?

    Or will it revert all the way back to Snow Leopard, requiring the discs? Yes, it should work just fine. Lion through El Capitan has the Recovery built-in, and it will reinstall OS X using whatever current version you are on. If not, you might need to download the firmware to use the Internet Recovery version, but this installs whatever was originally on the computer, so you'd have to update your OS again from the Mac App Store.

    Everything works fine up until the last step after entering my ID and Password Try again later. My hard drive crashed on my Imac took it to computer repair they installed new hard drive, tried to recover data but could not, when we presented the imac to the apple store they told me i would have to buy back my old hd from them um hello no way, so thats why we went to another place that works on macs, so apple said i had lion on the mac, i couldnt remeber but now i remember i had leopard, the computer place installed lion, well now I cannot get any of my programs installed from the dics i have, like my photo software, etc, any cd i put in stays in for a minute then pops back out.

    I turn on the computer, hold the command and r keys for 15 sec.

    How to reinstall macOS from macOS Recovery

    Oh the joy of reading Service currently not available when it tries to download Mavericks online and all the while having only windows computer working. My late Mac Pro would not boot this AM. Would not let me reinstall OS X. Would any think it is more than a bad internal drive 1?

    I pulled the drive 1 out, checked all the pins and reinstalled into its slot firmly. It goes to grey screen and first tone There is not the "Reinstall the OS X" in my computer. Why not?

    Erase or Format Your Mac's Drives Using Disk Utility

    Now what can I do? Please help me. I really need my computer for work. Whenever I turn on my iMac, it would load up to the apple logo and shut down after a few seconds. This happened ever time i tried to turn it back on again. I had a bit of hope but nothing ever changed so I decided to erase my disk and was immediately promoted me to restart my computer. When I did, it brought me a a symbol of a folder with a question mark which flashed forever. I held the power button to turn it off and hit it to turn it on again while pressing command and R keys at the same time, it brings me a sign of a spinning globe that loads forever.

    When I restart it and immediately insert its installation DVD while pressing key C, it brings me the apple logo and stays like that for ages.

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    This is freaking me out. I have read and tried so may solutions online but nothing has changed. Please help me with another way. If I am currently running a public beta of El Capitan, will this method still work and install the official release of El Capitan?

    ERASE MAC HARD DRIVE AND REINSTALL OS X! EASIEST METHOD!

    There's a good chance that it will re-install the public beta version, since it was the most recent OS installed on your Mac.