By default, Mac starts from its built-in hard disk, but a startup disk can be any storage device that contains bootable contents that compatible with your Mac. For example, if you install macOS or Microsoft Windows on a USB drive, your Mac can recognize that drive as a startup disk. This guide provides 2 ways to boot a Mac from a USB flash drive.
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Jul 31, 2018 Intel-based Mac. Bootable USB thumb drive formatted with a GUID partition type and containing an OS X installer or a usable operating system. Let’s see how to boot a Mac from a bootable USB drive and what to do if your Mac doesn’t start up from it. Way 1: Boot Mac from USB Drive using Startup Manager. Getting your Mac to load from a USB. May 04, 2019 This guide assumes that you own a suitable retail Mac OS install CD and that you can create a disk image from it. Install CD image files can also be downloaded from various places on the internet. Make sure the image is indeed created from a general retail Mac OS install CD. Any usual disk image file format will do as long as it is not a read-only or compressed format. In OS X, mount a bootable OS 9 CD. Open Disk Copy. In the Image menu, select New Image from Device. Select the CD. Name the image, and use the CD/DVD Master format when saving the image file. Eject the CD. Now you can open the image file, rename it, and add or remove any files or apps you want. When you 'eject' the image, the changes will be saved. To create Acronis bootable rescue media: 1. Connect a removable drive to your Mac. The drive must have 4 GB (or more) of free space. For example, you can use an external hard drive or a USB flash drive. Note that CD and DVD media are not supported. Open Acronis True Image 2020. In the File menu, click Create Acronis Bootable Media. Feb 22, 2011. Mac OS 9.1 updater (updates Mac OS 9.0 - 9.0.4 to 9.1). Mac OS 9.2.1 updater (updates Mac OS 9.1 or 9.2 to 9.2.1). Mac OS 9.2.2 updater (updates Mac OS 9.2.1 to 9.2.2). Disk First Aid 8.6.1 (in case you use an earlier version). Movie from Macworld on the subject. How do I make a bootable CD for my Mac using Toast? (Article from Roxio's.
Apr 19, 2019 CopycatX and Drive Genius both have the ability to block level clone an entire hard drive (Mac and Bootcamp partitions) to another drive in a single operation. I have used both successfully to do this, but not recently. I have successfully used Winclone several times recently to image and restore the Bootcamp partitions, which, with CCC or similar for macOS would enable you to replace the hard.
Requirement
Starting up your Mac from an external disk requires the following:
- Intel-based Mac.
- Bootable USB thumb drive formatted with a GUID partition type and containing an OS X installer or a usable operating system.
Let’s see how to boot a Mac from a bootable USB drive and what to do if your Mac doesn’t start up from it.
Way 1: Boot Mac from USB Drive using Startup Manager
Getting your Mac to load from a USB drive is fairly straightforward. Use the following steps, you can easily set Mac boot from an external drive in Startup Manager, so it’ll only boot from USB that one time.
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Step 1: Insert the USB boot media into a USB slot.
Step 2: Turn on your Mac (or Restart your Mac if it’s already on).
Step 3: Press and hold the Option key immediately after you see the Apple logo. Holding that key gives you access to OS X’s Startup Manager. Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content.
Step 4: Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from. Once selected, either hit the Return key or double-click your selection. The machine will start to boot from the USB drive.
Way 2: Set a Mac Boot from USB Drive using Startup Disk
When you use Startup Disk preferences to set Mac boot from an external drive, so it’ll boot from that disk until you choose a different one. Here is how:
Step 1: Go to Apple menu > System Preference, then click Startup Disk.
Step 2: Click the locked icon and then enter your administrator password.
Step 3: Select External drive as the startup disk, then restart your Mac.
What to do if your Mac does not boot from the selected drive
If you see a message prompts that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility, and then allow your Mac to use an external startup disk.
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Step 1: Open Startup Security Utility.
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Turn on your Mac, then press and hold Command (⌘) + R immediately after you see the Apple logo. Your Mac starts up from macOS Recovery. When you see the macOS utility window, choose Utilities > Startup Security Utility from the menu bar. When you’re asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.
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Step 2: Select “Allow booting from external media“.
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If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu > Startup Disk.
Note: If you’re using Boot Camp in a dual-boot Windows/OS X environment, you may be unable to boot negatively into supported versions of Microsoft Windows XP, Windows Vista or Windows 10 operating systems installed on external USB hard drive.
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Make sure disk has been formatted with a GUID partition type
Intel-based Macs support starting from an external USB storage device’s volume that has been formatted with a GUID partition type. If you wish to boot from the drive, it’s important to format the partition as “GUID Partition Table” rather than either of the other two ahead of time when you use that drive as a bootable drive.
Make sure your disk is bootable
Volumes that aren’t bootable and don’t contain a copy of a valid operating system aren’t listed in Startup Disk or Startup Manager. Make sure the external drive you’re trying to start from contains a usable operating system.