Enter your Apple ID email and password on the pop-up. Go to the Apple menu bar where the Apple logo is at the top left corner and Choose Account > Authorizations > Deauthorize This Computer. To reiterate, you will lose all of your files and settings and they will be irrecoverable, so please ensure you have backed up your important data. How to remove the Mac from associated devices: 1. Once this process has completed, you should then be able to use Disk Utility to create a new partition table by formatting the storage device. Enter a name for the hard drive in the Name box and click Erase. The installed SSD was a replacement and is missing the temp sensor, so the fan at times will spin up high. Click the Format pop-up list and select Mac OS Extended (Journaled). The system was absolutely fine, I was just trying to erase the hard drive for sale. NOTEI have wiped the disk and have not been able to reload El Cap OS, it works for quite awhile and then reboots to nothing. It will be quicker to simply erase the partition table on the storage device, but if you want to be thorough, this is the best approach. Powers on just fine and works as expected. Sudo dd if=/dev/zero of=/dev/diskX bs=10m Then, from the menu bar item, select Erase All Content and Settings as shown in Figure 2. If the latter, you can use the Terminal application to identify, unmount, and erase the storage device as follows: To access the feature, go to Apple menu > System Preferences. Note that you'll lose all of your files and settings, so if you have a Time Machine backup, it may be worthwhile trying to restore the most recent working backup beforehand. Whilst in recovery mode, you can also reinstall MacOS. USB) storage device? If the former, you'll need to enter recovery mode (by holding Command+R during the boot sequence) and use Disk Utility to erase the storage device. Are you attempting to erase the storage device that contains the MacOS operating system installation, or simply an external (i.e.
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