Or perhaps you deleted the GPT table, and are now using an msdos partition table. This process will erase whichever OS you're currently using from your hard drive entirely. That means any files, programs, or documents you have will be deleted. To save your files, put them on an external hard drive or a cloud-based program like Dropbox, OneDrive, or iCloud.Ubuntu images (and potentially some other related GNU/Linux distributions) have a peculiar format that allows the image to boot without any further modification from both CDs and USB drives.If you want to give your Mac a fresh restart, you can perform a clean install of Mac OS. Here is how to clean install macOS High Sierra, Sierra or OS X on Mac.I have recently done a Time machine back up of my MB Pro 15' then wiped my hard drive trying to clean it up so I could install Windows 7 with Boot Camp.If OS X El Capitan came preinstalled on your new Mac, youll probably never. At that time, its a good idea to erase the disk and install a fresh copy of./dev/xxx contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should.Delete /groups/username(this may not be — you may get an error that the group doesn't exist you can ignore it and go on).At this point, you may wish to remove or archive the user folder in /Users. Delete /groups/groupname GroupMembership yourusernameRepeat for each group except for the user's own group.Remove the group corresponding to the username: $ dscl. -list /groups GroupMembership | grep usernameAnd then remove your username from the groupname: dscl. For Mac OS X up to 10.6: $ launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plistFor Mac OS X 10.7: $ launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plistNote that single user mode said to use com.apple.DirectoryServicesLocal.plist, but that didn't work —this did.Find what groups the user belongs to: $ dscl. Hold Command-s at startup.If no remaining errors, mount the filesystem: $ /sbin/mount -uw /Start up directory services. To more properly remova all user data, I would follow the instructions described here:Boot into single user mode.Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key. I found this blurb in the apple forums that discusses a few options without disks. All done? Type $ reboot to reboot the system or $ shutdown -h now to shut down the system.I have a MacBook Pro that was originally a machine from an old company so I didn't have the original disks either and I too was looking for a way to clean off the machine. $ rm /var/db/.AppleSetupDone AppleSetupDone file in /var/db to cause the Setup Assistant to run when next booted (aka Out Of Box Experience). Delete /users/usernameYou may wish to remove the.
Erase My Hard Drive For Clean Mac A FreshClick the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions. If you do, you must restart from the disc again to access Disk Utility. (In Mac OS X 10.4 or later, you must select your language first.)Important: Do not click Continue in the first screen of the Installer. Or.Bootup holding CMD+ R, or the Option/ Alt key to boot from the Restore partition & use Disk Utility from there to erase & reinstall.You can can erase or reinstall OS X from the recovery partition. After completion do a new install.Open System Preferences>Accounts, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.In the same pref pane highlight your old account, click the little minus icon, then use Disk Utility to Secure Erase Free Space. MacOS Extended Journalled, select the Security Options button, choose Zero Out Data, Erase. (Optional) HDDs can be erased securely by selecting one of the options in Erase > Security Options. Erasing the whole drive would also remove the recovery partition, and the Mac would have to start up in internet recovery mode. Select the main volume (like Macintosh HD, shown indented below a drive). C64 emulator macIt always creates a recovery partition, so you can follow the instructions above after that. 10.6 and earlierIf your Mac meets the system requirements for 10.8, you can install 10.8 from App Store. (Optional) Choose Reinstall Mac OS X to perform a clean installation.Choosing Reinstall Mac OS X without erasing the old installation just upgrades the old installation. Open the Erase tab and press the Erase button. ![]()
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