Reinstall from macOS Recovery
Before you can install macOS to the new drive, you'll need to format the drive so the installer can recognize it. Open Disk Utility from the recovery menu, select your drive, and click the Erase button toward the top of the Disk Utility window. Make up a name for your drive, and make sure the format is set to Mac OS Extended (Journaled) or APFS. Like we said, an external macOS installation will probably be pretty slow and you’re probably only going to want to use it when the situation calls for it, such as if you’re having trouble with your internal drive or you want to use your portable macOS Sierra installation on another compatible Mac.
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Command (⌘)-R
Formatting Internal Macbook Drive For New Mac Os Install Download
Reinstall the latest macOS that was installed on your Mac (recommended).
Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac.
Shift-Option-⌘-R
Reinstall the macOS that came with your Mac, or the closest version still available.
![Formatting internal macbook drive for new mac os install usb Formatting internal macbook drive for new mac os install usb](/uploads/1/2/6/5/126587625/329327368.png)
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
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When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
- If the installer is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup. Free access repair tool.
macOS Recovery exceptions
Formatting Internal Macbook Drive For New Macos Install Usb
The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.
Partitioning your hard drive can be a frustrating and daunting task. However, once you understand how the process works, it’s a lot less scary. So why would you want to partition a drive?
Back when I was in college, like many other students, I had a MacBook Pro for ease of use and its minimalist aesthetic. I didn’t think about the fact that some applications that I needed for school were not compatible on Mac. That is when I thought about partitioning my drive so that I could run Windows on Mac.
In addition, I had an external hard drive that I also wanted to be able to use with both OS X and Windows. In this article, I’ll walk you through the steps for partitioning internal and external hard drives on a Mac.
Before you start, you should make sure to backup your entire Mac computer using Time Machine. Even if you don’t mess anything up, the chances are good that the OS will screw up and break your system.
Partition External Drive
If you have a large external hard drive, you can easily partition it so that the entire drive gets utilized. I was using a 1.5 TB external drive with my Mac, but never really used more than 1/4 of the space.
Instead, here’s how I ended up partitioning my drive, which ended up making it much more useful:
- 33%: Mac (Extra Storage) – 500GB
- 33%: Mac (Time Machine Backup) – 500GB
- 33%: Windows (Extra Storage and Backup can go on same partition) – 500GB
As you can see, each partition can have its own file format. If you have an even larger drive, you can create even more partitions for other operating systems like Linux, etc.
To partition the drive, go to Spotlight at the top of your MacBook Screen (Notification Bar) and type in Disk Utility.
On the left hand side, navigate to the tab that says EXTERNAL.
Yours will look a little bit different than mine. Under the External heading on the left hand side, you should have one hard drive instead of 3 (I have already partitioned mine). Navigate to that external hard drive and partition it according to your needs.
NOTE: If your external hard drive is not formatted for the Mac operating system, you may first need to Initialize it and then Erase it. It’s very easy:
Formatting Internal Macbook Drive For New Macos Install Data
- Under the external tab on the left side, select the drive you want to use.
- Then select the Erase option at the top
- Once there, give it a name and format it to Mac OS Extended (Journaled)
- For the Scheme, you can pick from GUID, MBR or Apple. If you’re only using the drive for storage, then it doesn’t really matter which one you pick. However, if you plan to boot from the drive, you should pick MBR for Windows and Linux and GUID for OS X. If you plan to use the drive for Boot Camp, you should also pick GUID.
Note that you can also click on Security Options and choose from different levels of security. By default, OS X will use the fastest method, which not does securely erase the drive. If you move the slider to Most Secure, it will meet the DOD standard for erasing data by overwriting the data 7 times. This will prevent anyone or any software from recovering any previously written data from the drive.
OS X may ask you if you want to use the drive for Time Machine backups, but you should choose Decide Later unless you want to use the entire drive for the backups. Now you’re ready to partition the external drive!
Go to the top where it has the options: First Aid, Partition, Erase, Restore, Mount, etc. Select Partition and create the partitions based on your specific needs. In my case, I chose a size of 500 GB, which is one-third of the drive. The latest microsoft office for el capitan 10.11.6.
Select how you would like to partition the drive (refer back to my percentages, as that’s what I have used in the screenshots here), select Apply and then click Partition. After this, it will take a few minutes to partition, so be patient!
When completed should see the green check mark next to your drive and it should say Operation Successful. Now select Done and you’re done with the first partition.
Now to partition the rest of the space, you will click on Untitled under External and then click on Partition again.
Give the partition a name, pick a size and choose the format. Since this is going to be for Windows storage, I chose MS-DOS (FAT). You can also choose exFAT if you like as that is compatible with both Windows and Mac.
Partition Internal Drive
Formatting Internal Macbook Drive For New Macos Installer
Partitioning an internal hard drive is pretty much the same in terms of the procedure you have to follow, but it’s a little bit different in how it gets implemented.
Since you already have OS X installed on your internal drive, when you click Partition and choose a size, you’ll notice that you can’t create a partition that is smaller than the amount of space already used on the drive.
My internal drive was already using 359GB of space, so when I typed in 200GB, it automatically changed it to 359GB and put up a message stating that the first volume cannot be removed and the volume could not be split because the resulting volumes would be too small.
Formatting Internal Macbook Drive For New Mac Os Install Error
So if you want to create an additional partition, the first thing is to create a partition that will include OS X and give you some additional space for installing programs, etc. Below, I left the name as Macintosh HD and made the partition 500GB. That means the partition where OS X is installed with have about 140GB of breathing room for extra data.
Basically, we are just shrinking the original partition, which took up the entire disk to something smaller. Then we will partition the free space as we like.
As you can see, I have made the original partition 500GB instead of 1TB, which frees up 500GB on the disk for creating other partitions. As with the external hard drive, once the partition has been created, click on Untitled, but this time under the Internal heading and click on Partition.
Formatting Internal Macbook Drive For New Macos Installation
That’s basically all there is to partitioning drives in OS X. Hopefully, it worked for you. Enjoy!