The OS x10.7 System of MAC Min is completely reinstalled without knowing the account password.

Status quo: 1. OS X 10.7 2. old account does not know Password 3. mac box objective: 1. delete old account 2. update the system to 10.9 or above. The attempt process is. press and hold the option key + boot 2. select "disk tool" 3. select the current system disk 4. select "erase" the entire disk (because there is nothing in the system before) 5. the error "failed to erase the disk: failed to unmount the disk" is displayed. (because the current disk is in repair mode, you need to use a USB flash drive or a CD to enter the repair mode.) process 2: (starting from 1.2) 1. select the partition of the current system disk. "erase"; (if all data and systems are lost, you can reinstall the new system.) 3. return to the previous level and select "reinstall Mac OS X" 4. download the new system online through the network (the old version is 10.7, and the new version is not downloaded; optional ~) 5. After the download is successful, the installation process may take about 40 minutes. 6. The new system is successfully reinstalled, but it fails to achieve all the intended purposes. (Unfinished Objective 2) the attempt process is. how to install Apple Mac OS x using a USB flash drive or a mobile hard drive to create a boot disk-Apple fans blog Guest OS X mavericks 10.9.4 (13e28) mas original image download-vision-Windows 8.1, update1, Professional Edition, system download, Windows Phone placement => copy to mobile hard drive (or USB flash drive) 4. insert a mobile hard disk starting from 1.2. select "recovery" and "image... 6. A corresponding disk is displayed in the disk list on the left. Double-click it, Open 7. Drag the opened partition to "Source Target" 8. Drag the partition to be restored (the one previously erased) to "destination" 9. Click "Restore. (The disk cannot be identified when you press and hold option at the end of the boot! [Failed !]) When I first came into contact with the Apple system, I had a very poor knowledge and could not achieve the desired goal in the way I wanted it within one day. It was a pity. As a result, the carriage and win + LINUX are not in the same dimension. Finally, we use "test process 1" + "test process 2" + to go to the system and "check and upgrade" for all purposes.