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Start up your Mac from a Bootable CD/DVD, USB thumb drive or external Storage Device

macOS is also able to start up your Mac in a myriad of methods. So we have already covered some of them in detail, like using incorporated Startup Manager in order to pick a disk to start up your Mac just from & also starting into Safe, Verbose & Target Disk modes.

Here, we get in order to talk just about beginning your Mac up simply from external storage such as the optical media, however, or an external USB-based hard drive or flash storage. Similarly, just starting from external storage permits you in order to start up your Mac. So in another version or copy of mac. In addition, it is also able to support you in troubleshooting certain problems, and further.


However, starting up just your Mac from an external disk also needs the following:

  • Intel-based Mac
  • Bootable optical media (CD or DVD) on Macs provided with Apple’s Super Drive. Or a USB thumb drives formatted just with a GUID partition simply type. And also having a macOS installer or a usable operating system.

Although Apple also gives suggestions against starting from external storage having a version of macOS simpler than the one your Mac shipped with.

Start-up your Mac from a bootable CD/DVD

  • First of all, you have to enable your Mac or reboot it whether it is already on by selecting Restart in the Apple menu.
  • Then press and also hold the C key on your keyboard instinctively upon hearing the startup chime. However, your Mac should also startup from the macOS installer CD/DVD media. So guys you are also able to press the left mouse button. However, just on a wired mouse simply during startup in order to head to the disc tray.

Tip: You are also able to easily burn a bootable image of macOS simply to a DVD by utilizing Disk Utility.

Start-up your Mac from an external USB storage device

Whether your USB thumb drive, USB external disk, or also the flash storage have a usable operating system or as well as a macOS installer. You are also able to choose it at the start time by using the macOS’ incorporated feature known as the Startup Manager. However, that is also able to be invoked via a simple keystroke.

  • Enable or restart your Mac.
  • Now you have to press and hold the Option key instinctively upon hearing the startup chime. Reveal the key just after Startup Manager visible. Similarly, the startup Manager will also scan and then the list connected drives and volumes. Though that can be booted from, as shown below.Start up your Mac
  • Here you have to highlight the volume you like in order to use just by using your mouse or trackpad. Or also left and right arrow keys on the keyboard.
  • Now Double-click or also press the Return key in order to boot your Mac from the chosen volume.

Instruction: Whether there are enormous USB storage devices connected to your Mac, Startup Manager will also just list the ones having the bootable volumes.

Start-up your Mac from an external volume using System Preferences

You guys are also able to use the System Preferences to tell your Mac to instinctively use optical media. However, or a USB-based external disk or also the flash storage every time it is restarted.

  • You have to head to the System Preferences application in the Dock.
  • Tap the Startup Disk pane. Here you will be presented with various disk icons.
  • Choose the system you would like to use to begin your computer up
  • Simply now click the Restart button in order to start up your Mac using the chosen volume.

Instruction: Well, your Mac will now always boot into the chosen startup disk. Though you are able to also change that in System Preferences. Or temporarily override it via Startup Manager.

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Troubleshooting startup problems (Start-Up your Mac)

Well, should you run into issues whilst attempting in order to boot your Mac from an external storage device, consult our FAQ below? However, it will help troubleshoot any start-up problems you may be plagued with.

Is the storage device to an external power supply? or Not

Hanging on its model and also the power requirements, it probably is essential in order to connect your USB storage device to an external power supply.

Is the storage device connected and enabled?

Confirm that your external storage is enabled and also connected to your Mac. However, so than the USB-based external hard disks normally have the power on/off button at the back of the enclosure.

Does your disk need repair?

Whether your Mac does not start from an external volume. Or also the drive doesn’t display in Startup Manager although. It has a bootable copy of macOS, it probably needs repair.

Alright, the first order of business should be solving in order to repair disk permissions in Disk Utility. And also in the worst-case scenario, you probably have to reinstall macOS on the external volume.

Have you ever try using various USB ports? (Start-Up Your Mac)

Whether you own a MacBook or also the MacBook Pro, so then you have to keep trying using various USB ports if you cannot startup just from the external USB storage device.

Has the disk been formatted with just a GUID partition type?

Though Intel-based Macs help to start from an external USB storage device’s volume. However, that has also been formatted with a GUID partition type.

Does your Mac shut down automatically upon connecting the disk?

Well, Apple said that a MacBook Air also contains a precautionary measure. Though, which brings about the PC in order to shut down automatically. Whether the connected USB storage device also has problems. Or whether the USB port on the MacBook Air itself is injured.

Have you ever use the Boot Camp?

Whether are you utilizing the Boot Camp in a two boot Windows/macOS environment. So you probably be not able to boot natively. Simply into supported versions of Microsoft Windows XP, also Windows Vista, or Windows 10 operating systems though installed on an external USB hard drive.

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Are you utilizing an external USB hub?

Simply utilizing an external hub in order to connect various USB devices probably causes your Mac to fail to recognize them at the start time. So you have tried connecting the USB drive just to another port on the hub. However, guys should that fail, connect the disk directly into your Mac’s USB port. Remember that some USB hubs and also the external USB storage devices have an external power supply, just hanging on to their power requirements.

Is the disk connected to the keyboard’s USB port?

Well, both wired & wireless Apple Keyboard, and also further keyboards with incorporated USB ports. Probably not supply enough power just to some external USB hard drives.

Is the disk bootable?

Confirm that the external drive that you are trying, to begin with, has a usable operating system. Though the volumes that are not bootable & do not have a copy of a valid operating system are not listed in Startup Disk or Startup Manager.

Are you utilizing the wireless keyboard?

Whether you guys are using an Apple Wireless Keyboard or another Bluetooth keyboard, however, with your Mac, so the keystrokes won’t be recognized simply during the startup method. Because Bluetooth is not logged in at boot time. To connect a wired keyboard or utilize the incorporated keyboard whether you own a Mac notebook. However, the exact disclaimer applies just to hold the left button on a wireless mouse similarly, during bootup in order to head to the disc tray.

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Further methods in order to start up your Mac

Additionally to what we already explained above, so your Mac is also able to start up in a number of various ways. Just adding the following ways that our guide provides step-by-step instructions for:

Safe Mode

Guys, you are also able to invoke it by just pressing and holding the Shift key. Similarly, after hearing the startup chime. So the safe Mode turns off certain features of macOS and also loads only important components in order to make troubleshooting software issues simpler. However, it also includes an automatic disk check & also repair that probably resolves boot issues and also able to permits you to start up your PC successfully.

Verbose Mode

However, the Verbose Mode is also a text-only environment simply that shows status messages as the startup method progresses. Well, you have to press & hold the Command – V key combination after hearing the startup chime in order to enter Verbose Mode. So you are also able to use this mode in order to troubleshoot startup problems and also resolve issues with kernel extensions & custom hardware. Whilst permitting you to view exactly what’s going on behind the scenes as macOS loads its components.

Target Disk Mode

Although the Target Disk Mode permits a Mac simply to be used as an external hard disk just connected to another Mac. If you are desiring to enter Target Disk Mode, enable your Mac and hold down the T key instinctively upon hearing the startup chime. At a time the PC is in Target Disk Mode & present as an external volume just to the host Mac. Well, you are also able to copy files to or from that volume. You are able to also start up any Mac with a FireWire, however, or Thunderbolt port in Target Disk Mode.

Startup Manager

Alright, the macOS’ incorporated Startup Manager is also able to permit you to pick a volume in order to start your Mac up from at start time. However, that temporarily overrides your startup disk defaults set in System Preferences. Only you have to enable your Mac. So then hold the Option key just after the startup chime & release it after Startup Manager visible.

System Preferences

In order to turn your default startup disk, simply use the Startup Disk pane just in the System Preferences app. However, your Mac will also start into the selected disk till you select another one. Or temporarily override your selection just by using Startup Manager at the start time.

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Well, guys, I hope that you will like the guide. Because we have thoroughly explained it to you. In case of queries, you can ask us in the comments section below.

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