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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.

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.

1. Choose Apple () menu > System Preferences, then click Startup Disk.
2. Click and enter your administrator password.
3. 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

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.

1. Press and hold the Option key immediately after turning on or restarting your Mac.
2. 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.
3. 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.”

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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 valid operating system on the startup disk

Make sure that your startup disk is using a version of macOS that's compatible with your Mac. You might need to reinstall macOS on that disk.

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 your startup disk, press Option-Shift-Command-Period. If that works, do this each time you want to start up from the device or from a startup disk connected to it.

To enhance system security, Mac computers with up-to-date software don’t show devices that have Option ROM firmware until you press these keys in Startup Manager to load the firmware. On Mac models from early 2015 or earlier, you can disable this security feature to load Option ROM firmware automatically. This removes an important protection against potential unauthorized access to your Mac by other people with physical access to it.

1. Open the Terminal app, which is in the Utilities folder of your Applications folder.
2. Type sudo nvram enable-legacy-orom-behavior=1, then press Return.
   To undo this command, enter sudo nvram -d enable-legacy-orom-behavior.

If you're using a firmware password on your Mac, the ability to load Option ROM firmware automatically or manually is disabled as an additional security protection. If you want to remove this additional protection but keep your firmware password:

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1. Open the Terminal app, which is in the Utilities folder of your Applications folder.
2. Type this command, then press Return:
   sudo firmwarepasswd -setmode command -allow-oroms
   To undo this command, enter sudo firmwarepasswd -setmode command.
3. Type the administrator password for your user account, then press Return.
4. Type your firmware password, then press Return.
5. Restart your Mac.

BestCD/DVD Drives for MaciMore2019

If you've recently upgraded to a new iMac or MacBook Pro, you're probably going to need an optical drive if you want to continue importing your movies and music to iTunes, or just access the content on your discs. If you think you'll need an external drive mostly for Blu-Ray discs, most of them will also play DVDs and CDs but are not readable/writable drives for CDs or DVDs. Either way, here are some solid options.

Best External Backup For Imac

No adapter needed: Confoly USB-C Superdrive

Staff pick

I have this model CD/DVD drive for my Mac computers for multiple reasons. For one, it's practically the same as Apple's SuperDrive in every way, and second, it's got a USB-C cable so I can connect it to my MacBook Pro without needing any additional adapters. Oh, there's a third reason, too. It comes with a USB-A adapter so I can connect it to any standard USB port.

$49 at Amazon

Cupertino's own: Apple USB SuperDrive

Apple's branded playable/burnable CD/DVD drive is the perfect complement to your iMac or MacBook Pro unless you have a late 2016 or newer MacBook Pro, in which case you'll need the USB-C to USB adapter. It's not much larger than the size of a CD case, so it fits snug in your computer bag without taking up a lot of room. All you have to do is plug it into your computer using the USB cable. There's no need for special software or external buttons that might get broken. It's solid, simple, and it looks great with your Mac products.

$79 at Amazon

USB-C and USB 3.0: VisionTech External CD/DVD Drive

With no eject button on the device and powered by USB the VisionTech External CD/DVD Drive is very slim and compact. You can tuck it away anywhere that makes the most sense for you. Preprogrammed for both Mac and Windows, you shouldn't need to do any formatting to get the drive to work. Plus, this drive has both USB 3.0 and USB-C cables, meaning you can plug it right into your MacBook with no adapter needed.

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$31 at Amazon

Inexpensive choice: LG GP65NB60

LG makes a CD/DVD drive that is lightweight, fast, and doesn't cost much. It's made of a hard shell plastic material, so it isn't going to feel as sturdy as Apple's SuperDrive or Confoly's USB-C drive. However, in exchange, you get something that's about as light as a CD in its case.

$25 at Amazon

Also worth considering: Verbatim External CD / DVD Writer

Here's another inexpensive choice, this time from Verbatim. Weighing just 12 ounces, this CD/DVD burner is compact, lightweight, and USB powered. It's a suitable choice if you need to back up sensitive data, as well as music and video libraries.

$24 at Amazon

Still serving a need

There are a lot of reasons why you'd need a CD/DVD drive for your Mac, despite the concept being heavily outdated in 2019. Whether you want to digitize your DVD collection or just view a disc on your computer, an optical drive is cheap and sometimes necessary.

As you can see, we've selected the Confoly USB-C Superdrive as our favorite since it's super similar to Apple's SuperDrive and you don't need adapters to utilize it. If you're working with a small budget, take a look at the LG GP65NB60. It gets the job done for a surprisingly low price.

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Best Portable External Hard Drive For Mac

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