By default, your Mac starts up from its built-in hard disk, but a startup disk can be any storage device that contains an operating system compatible with your Mac. For example, if you install macOS on an internal or external drive, your Mac can recognize that drive as a startup disk. You can then follow the steps in this article to start up from it.
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You can go back and forth between OS X and Windows on your Mac, but you can’t run both operating systems simultaneously under Boot Camp. Instead, you have to boot one operating system or the other — thus, the name Boot Camp. Restart your Mac, and hold down the Option key until icons for each operating system appear onscreen. How can I make Mac Partition visible in Bootcamp (Windows 10 Anniversary Update)? Only Driver as a part of the Boot Camp software. The partition, but OS can't. Mar 12, 2020 Find the appropriate download link in the upgrade instructions for each macOS version: macOS Catalina, macOS Mojave, or macOS High Sierra Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra.
Use Startup Disk preferences
When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one.
The easiest and well known way to install Windows on a Mac is by running the Boot Camp app on the Mac and let it do what's necessary. The problem is that I don't want to partition the Internal SSD so the remaining option is to install Boot Camp Windows 10 on an External Drive and boot it every time I need it by plugging in my external USB 3.0 HDD.
- Choose Apple menu > System Preferences, then click Startup Disk.
- Click the lock and enter your administrator password.
- Select your startup disk, then restart your Mac.
If you see a message that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility.
Use Startup Manager
Mac Os X Boot Camp External Drive Windows 10
When you use Startup Manager to select a startup disk, your Mac starts up from that disk once, then returns to using the disk selected in Startup Disk preferences.
- Press and hold the Option (Alt) key immediately after turning on or restarting your Mac.
- Release the Option key when you see the Startup Manager window.
If your Mac is protected by a firmware password, you can release the key when you're asked to enter the password.
- Select your startup disk, then click the arrow under its icon, or press Return.
If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it.
If your Mac is using OS X Lion 10.7.3 or later, you can also use this method to start up from your Time Machine backup disk. Startup Manager identifies your Time Machine backup as ”EFI Boot.”
If you can't select your startup disk or start up from it
Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it.
Check for a compatible operating system on the startup disk
Make sure that your startup disk is using a version of macOS that is compatible with your Mac.
To start up from an external disk with macOS Catalina 10.15 or later, the disk must connect via USB-A, USB-C, or Thunderbolt, not FireWire.
Check startup security settings
If you're using a Mac that has the Apple T2 Security Chip, check the settings in Startup Security Utility. These settings determine whether your Mac can start up from another disk.
Check for Option ROM firmware
If you're in Startup Manager and can't see a third-party startup disk, the startup disk could be using Option ROM firmware. To enhance system security, Mac computers with up-to-date software don’t show devices that use Option ROM firmware until you load their firmware. To do that, press Option-Shift-Command-Period while in Startup Manager. If your startup disk appears, do that each time you want to start up from it or from another disk connected to it.
If you're using a firmware password, the ability to load Option ROM firmware is disabled as an additional security protection.
If you own Intel-based Macs, you can run OS X and Windows on one machine. In fact, it’s been possible to run Windows on a Mac for some time — with agonizing limitations. Near-extinct Mac models were loaded with Virtual PC emulation software could do Windows, too, but the program was painfully slow. Even if you find an old copy of the software, it won’t work with any current Macs.
Boot Camp software from Apple shook up the computing public upon its apocalyptic arrival in April 2006. Boot Camp graduated from beta, or near-finished, status with the arrival of Leopard. Boot Camp Assistant software is stored in the Utilities folder inside the Applications folder.
Boot Camp itself is free. You have to supply your own single-disc or downloadable full-install version of Windows; an upgrade disc won’t cut it.
It’s also important to note that you can use a 64-bit version of Windows, Windows 7 (Home Premium, Professional, or Ultimate), Windows 8, or Windows 8.1. Consult Apple support to see which Mac models are compatible with which versions of Windows. In its current incarnation, Boot Camp isn’t compatible with 32-bit versions of Windows.
Other requirements follow:
An Intel Mac with OS X version 10.6 or later
At least 2GB of RAM and 20GB of available space on the Mac’s storage drive that you want to donate to Windows
A blank CD or USB storage device that you’ll use for Windows software drivers
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If you don’t run into snags, the entire installation should take about an hour.
Windows 8 and Windows 8.1 are optimized for a touchscreen environment, though you can use it with a standard mouse and keyboard. For now, Macs don’t support touchscreen computing.
To install Windows 8 via Boot Camp, you still must have a legitimate Windows 8 license from Microsoft and a Win8 installation disc, assuming that you have an optical drive. If you don’t have an optical drive, you may be able to create a Windows installer from an ISO file downloaded from Microsoft on a USB flash drive that’s 8GB or larger.
Because snags are possible, back up all your important information on the Mac’s startup disk.
Following are the basic steps to get through Boot Camp:
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Run Boot Camp Assistant (in the Utilities folder inside the Applications folder) to make sure that you have the latest firmware on your computer and to install any support software from Apple that you might need.
You’ll find any updates at Apple support. If you’re using a portable computer, make sure to connect the power adapter. You will also be given the option to create a Windows 7 (or later version) install disk for which you’ll need a USB flash drive and an ISO image downloaded from Apple.
Follow the prompts in Boot Camp Assistant to create a partition for Windows.
You’re essentially carving out an area of your hard drive for the Windows operating system,. This partition must be at least 30GB and can swell to the total free disk space on hand minus 30GB. If you don’t plan on doing much in Windows, keep the partition small.
Drag the divider to set the partitions for both OS X and Windows, or click Divide Equally to make equal partitions. You can’t resize a Windows partition after creating it, though you can replace it with a larger Windows partition.
If you have a Mac Pro with more than one internal hard drive, you can select which drive to partition. If any of this makes you nervous, know that you can remove the Windows partition later and go back to a single-partition Mac.
Insert the Windows CD or a USB flash drive with the Windows ISO file and then click Start Installation.
If you exited Boot Camp Assistant before installing Windows, open it again, choose Start the Windows Installer, and click Continue.
When you’re asked to choose the Windows partition, select the partition that says BOOTCAMP.
You may have to scroll down to see it.
Don’t erase any partitions that you see or create a new partition here. Failure to heed this warning could wipe out your entire Mac OS X startup disk.
(Optional) If you see a listing for Drive Options, click it; otherwise, proceed to Step 6.
Reformat the partition by using the Windows installer: Click Format.
You’re using the reliable and secure NTFS file system, but you won’t be able to save files to Windows from Mac OS X, at least not without a techie workaround.
Follow the onscreen instructions to finish installing Windows.
Boot Camp 5.1 includes several Mac drivers so that Windows will recognize your trackpad, Thunderbolt, USB 3.0, the iSight (or FaceTime) camera, the Eject key on the Mac keyboard, networking, audio, graphics, and so on.
A Boot Camp Control Panel for Windows and an Apple Boot Camp system-tray item will be added.
As with any new Windows computer, Microsoft requires that you activate your Windows software within 30 days.
Switching operating systems
You can go back and forth between OS X and Windows on your Mac, but you can’t run both operating systems simultaneously under Boot Camp. Instead, you have to boot one operating system or the other — thus, the name Boot Camp.
Restart your Mac, and hold down the Option key until icons for each operating system appear onscreen. Highlight Windows or Macintosh HD, and click the arrow to launch the operating system of choice for this session.
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If you want OS X or Windows to boot every time, choose app → System Preferences, click Startup Disk, and choose the OS you want to launch by default.
Os X Boot Camp External Drive
You can perform the same function in Windows by clicking the Boot Camp system-tray icon and selecting the Boot Camp Control Panel. Click either the Macintosh HD or Windows icon, depending on your startup preference.