To use Recovery Mode, reboot or start your Mac and hold the Command and R keys simultaneously on your keyboard as you see the iconic white Apple logo against a black screen. The OS X Utilities screen will appear and here you want to click on Reinstall OS X.Starting with the release of macOS Lion in 2011, Macs have offered a Recovery Mode that users can access to diagnose hardware issues, restore Time Machine backups, manage hard drives, and even reinstall macOS itself. This will load up OS X Recovery. The second method to install OS X is to restart the Mac and press and hold the COMMAND + R keys. Note that by default, the Mac will start booting up directly to the external hard drive until you change it.A little bit of Mac know-howwe’ll be digging into Disk Utility to erase the hard drive, single user mode, and root access. A Mac in need of hard drive resetting. Hold down Option/Alt during. Select the external drive you wish to use to start up the Mac and click Restart. Open System Preferences > Startup Disk. You can let go of the keys when you see a screen similar to the screenshot below.Step 4: Run macOS on the external drive.
Recovery Mode is possible thanks to the installation of a hidden recovery partition on your Mac’s hard drive and allows the user to perform the aforementioned tasks without needing a macOS DVD or USB installer. I had Mac OS X 10.5 (Leopard) and the included Applications. Installer discs for the software you wish to restore. Dmg file wont openTo use this feature, you’ll need an active Internet connection and a Mac introduced after the public availability of OS X Lion, which includes the Mid-2011 MacBook Air and up. Further, if your Mac’s drive lacks a recovery partition for any reason, you may still be able to access macOS recovery tools via macOS Internet Recovery, which loads the recovery information directly from Apple’s servers. If you want to write to NTFS formatted hard drives in Mac OS X, youre going.A recovery partition will be created by default on new macOS installations and upgrades, but not every Mac configuration is supported, including RAID system drives. Set Up Harddrive Update As NeededThese keys include holding the C key during boot to boot directly from an inserted CD, DVD, or bootable USB drive on older versions of macOS, and holding the N key to perform a NetBoot to a compatible network server. As long as the Mac is compatible with the operating system contained on the selected drive, your Mac will continue booting the designated operating system.Examples of when you may need to use the Mac Startup Manager include booting to your Windows Boot Camp partition, booting to a complete cloned backup of your system drive, or reinstalling macOS from a DVD or USB drive.The Mac Startup Manager works great if you have a number of boot options from which to choose, but your Mac also recognizes a few additional startup keys that direct it to boot immediately from a specific source. You can use your mouse, trackpad, or keyboard to select the desired drive, and either click on its upward arrow button or press Return once you’ve made your selection. After a few moments, you’ll see all of the bootable devices appear on your screen accompanied by their corresponding icons and volume names.The Mac Startup Manager will update as needed, so if you add or remove bootable drives or devices on your Mac, the list will automatically display the current options. Simply reboot your Mac and hold the Option key on your keyboard as soon as you see the Mac’s startup Apple logo. But for those who want to use multiple internal drives or partitions, Windows via Boot Camp, or boot to external drives, you’ll need to use the Mac’s built-in Startup Manager. ![]() ![]() Single User ModeRelated to Verbose Mode, Single User Mode also shows you the full details of your Mac’s boot process. If you aren’t familiar with your system’s Terminal, however, it’s highly, highly recommended that you leave this to the professionals.To exit Verbose Mode, type “reboot,” (no comma) and press the Return key. You can also enter UNIX commands into this, just like a standard Command Terminal. To use Verbose Mode, reboot your Mac and press and hold the Command and V keys simultaneously as soon as you see the Apple logo on startup.You’ll soon see quickly moving rows of text instead of the gray boot screen, and you or a tech support rep will be able to see exactly what is causing the issue you’re attempting to troubleshoot. This makes booting your Mac a simple and pleasant experience, but can also hamper troubleshooting efforts.To see what’s really happening during your Mac’s boot process, you’ll want to enable Verbose Mode, which lets you see the messy details during boot in order to identify any drivers, kernel extensions, or other issues that are causing your Mac grief. You can now directly connect your Mac to another Mac with a FireWire or Thunderbolt cable and access the first Mac’s drive. Keep holding until you see a white FireWire or Thunderbolt logo appear on the screen (depending on your Mac’s hardware capabilities). This not only lets you easily access data on a Mac’s hard drive, but it also lets you use one Mac’s hardware to boot another Mac’s operating system and data.To use Target Disk Mode, reboot your Mac and hold down the T key as soon as you see the Apple logo. While in Target Disk Mode, you can connect your Mac to another Mac via FireWire or Thunderbolt and see the contents of the Mac’s drive mounted on the second Mac as if the drive were an external FireWire or Thunderbolt device. Single User Mode is a way to enter UNIX commands related to your Mac’s startup from the Safe Mode desktop rather than the pre-startup screen.Target Disk Mode is a very useful feature exclusive to Macs that, in effect, lets you turn your Mac into an unnecessarily complex external drive. But instead of taking place at the beginning of startup, you enter it after booting your Mac in Safe Mode. I was so freaked out at the time after trying everything possible (info from Apple support site & other net places). Once you’re familiar with these options, however, just use the table below as a handy guide in case you forget the specific keys necessary for each option.H E L P □ Total nitwit that I am, several months back I did something dreadful to my iMac & it’s never forgiven me. SummaryIt’s important to read over the description of each Mac startup option to ensure that you understand its use and purpose. ![]()
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