Erasing mac hard drive without disc

Reader Jim Kay, who asked about migrating from one Mac to another a couple of weeks ago, had a second question as well that opens a delightful can of worms:. Wiping or erasing a drive has a surprising number of definitions.


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In the olden days, in the long ago, we ran utility software that often came from third parties, which would simply delete the catalog and related records. Such an erase was, in practice, the best way to create a clean installation. To get rid of old data in a thorough fashion, you need use a multi-pass approach, in which every bit of storage in the disk is overwritten with new data often zeroes. When you select a volume in Disk Utility and then the Erase tab, you can click Security Options to pick how many times the drive is overwritten: Once is considered enough for regular purposes, while three and seven correspond to different U.

Restart a Mac and hold down Command-R after the startup chime sounds, and the computer boots into the recovery mode. Select Disk Utility from the startup menu, and you can erase your startup drive securely. You'll save a little time if you do an erase without overwriting, then reinstall OS X, then Erase Free Space with an overwriting option. First, erase a drive without the overwriting part, and reinstall OS X.

After you boot, launch Disk Utility, select the startup volume, and click the Erase tab. Now use the Erase Free Space option, which also offers 1, 3, and 7 passes of erase, and only empties out unused parts of the disk. The advantage is that your computer remains available though often slow while this operation is underway. If you use FileVault, any data "left behind" on your erased hard drive will be totally unreadable by your Mac's next owner. Enter the password for any FileVault-enabled user account, and the disk is unlocked and can be erased.

I'm currently running the new Yosemite. Ugh how frustrating 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?

Installing Mac OS X on Blank Hard Drive Using Internet Recovery

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.

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Securely erase a Mac hard drive

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. 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.

Securely erase a Mac hard drive

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? 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.

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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. This is freaking me out. I have read and tried so may solutions online but nothing has changed.

Mac 911: How to erase your Mac's hard drive the right way

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? 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. Apple suggests installing from the Mac App Store instead. Now I need to format the new HD. Do I need a utility disk? I never created one on this Macbook Pro can I create a utility disk from a newer iMac?

Select the disk from the menu, select your language, then choose Disk Utility from the Utility drop-down menu and proceed to reformat it to the right settings. Then you can go back and install the OS. Try again later can anyone help me how to recover all the apps without recovery disc and without back up?

Erase and leave no trace

I am just wondering. Hey Adriel. So I'm having a slightly different issue. I've followed your steps, but every time I hit "erase," it brings up a notice saying: Couldn't unmount disk.

I've attached a pic of the error. However, on the left one can clearly see the main " But it allowed me to erase the Macintosh HD option. Why is that?