Reinstall mac os x erase hard drive

Software Downloads. Instructions for installing an internal drive as a bootable or a storage drive in MacOS X. Physically install the drive into the Mac. Power on the computer while holding down the option key.

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Select Installer. Select Disk Utility. Highlight the drive. Enter Volume information Name, Format, and Scheme. Select Erase.


This will erase all data from the drive. Select Partition. Select Utilities. Select the Erase tab. Verify that the correct hard drive is selected in the left column.

Installing a fresh copy of macOS via Recovery Mode

Highlight the drive Select Partition. Select Install OS X from the options Select your drives as the destination and install Allow time for the drive to format. Verify the drive is mounted on the Desktop.

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Selecting a different country will clear your cart. Europe, Middle East, Africa. First, erase a drive without the overwriting part, and reinstall OS X.

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

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.

Make Your Mac Feel Like New Again With a Fresh Install of OS X

Without the key, which is uncrackable in any realistic period of time by any current technology, the erased data is as good as gone as if it had been written over millions of times. You can then install OS X on that partition, either from the recovery system or via an external drive. Reader Peter wondered how FileVault figures in to cloning a disk.

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Andrew Robertson writes that when he upgraded to Yosemite, his recovery drive remained out of date with You can reinstall This should upgrade the recovery partition. To recover a key , first start up OS X normally, and enter the wrong password three times. This is also how to use iCloud password recovery on non-FileVault systems.

Reinstall from macOS Recovery

Email us at mac macworld. How to encrypt your Mac with FileVault 2, and why you absolutely should.