If you're thinking about installing macOS Catalina, the first thing to consider is whether you want to install it directly onto your Mac or create a bootable drive. You can use a bootable drive on a hard drive partition for dual-software installation, to install on multiple Macs in your home, or as a bootable drive if you can't use the Internet Recovery partition.
Note: These instructions require the use of Terminal. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program.
Before you start
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Sep 30, 2015 How to Create a OS X El Capitan Boot Installer USB Flash Drive. (maybe you are in that target disk in the command line, for example). If you’re on one of those earlier versions of Mac OS X you will need to use the DMG file instead of the createinstallmedia from the command line. Can this be achieved using an SD card instead of a USB.
Before you get started, make sure you have a thumb drive with at least 15GB of storage, or a spare external hard drive (one you aren't planning to use for anything else). You'll also need to download macOS Catalina and ensure that it's sitting in your Applications folder.
Oct 25, 2015 How to Create Mac OS X Bootable USB Pen Drive with Windows 10 / 7. This tutorial is for Mac OS X El Capitan, yosemite, etc. That is based on Mac OS X versions and successfully working on Windows 7 / 8.1 / 10. The Mac OS X image is required in order. How to create a bootable macOS Sierra installer drive. That’s why I like to make a bootable external drive for the sole purpose of installing the Mac operating system. When I need to tend to. Make A Bootable USB/SD Card On Mac OS X., Nayan Seth, Leave a comment. Many of us want to dual boot our PC or make a bootable disk, usb. Oct 07, 2019 Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now. If your Mac is using AFS+, select Mac OS Extended (Journaled) from the. Jan 28, 2020 After creating the bootable installer, follow these steps to use it. Plug the bootable installer into a compatible Mac.; Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it.
Note: After macOS Catalina has downloaded, it will automatically launch the installer to begin the installation process. Quit the installer when this happens.
And please: Don't forget to back up your Mac before you do anything.
How to format your external drive for macOS Catalina
You'll need to start with a clean thumb drive or external hard drive in order to make it a bootable drive.
- Plug the thumb drive or cable for your hard drive into the appropriate port on your Mac.
- Click on Finder in your Dock to open a Finder window.
- Select Applications from the list on the left side of the window.
- Scroll down and double-click on Utilities.
- What programs open dmg diles. Scroll down and double-click on Disk Utility.
- Select your thumb drive or external drive under External.
- Click on the Erase tab at the top of the window.
- Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now.
- If your Mac is using AFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the list of options.
- If Scheme is available, select GUID Partition Map.
- Click Erase.
- Click Done when the process is complete.
- Close the Disk Utility window.
Your thumb drive or external hard drive is now ready.
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How to put macOS Catalina onto your external drive
Important: You will need to use an administrator account on your Mac in order to run the Terminal commands to create a boot drive. You'll also need to ensure that macOS Catalina is in your Applications folder and you'll need to know the name of the external drive.
- Click on Finder in your Dock to open a Finder window.
- Select Applications from the list on the left side of the window.
- Scroll down and double-click on Utilities.
- Scroll down and double click on Terminal.
- Recall the name of your formatted external drivewhen entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/MyVolume. The name of the drive can't have any spaces and it is case sensitive.
- Enter the following text into Terminal (Don't forget to change the name 'Untitled' in the text below to the actual name of your external drive. Names are case sensitive and can't have any spacing.):sudo /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
- Hit the enter/return key.
- Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password.
The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.'
How to install macOS Catalina with a bootable installer drive
Once macOS Catalina is installed on your external drive, you can install it on any Mac with the drive plugged into it. You can use this installer to upgrade your operating system easily on multiple Macs or to help downgrade if you decide you want to go back to an earlier version of macOS.
If you're downgrading from macOS Catalina, please check out this guide instead.
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If you're upgrading to macOS Catalina, follow the steps below.
- Turn off the Mac you want to install macOS Catalina with the bootable installer drive.
- Connect the external drive to your Mac via the USB port.
- Turn on your Mac.
- Hold down the Option key when it starts up.
- Select the external drive with macOS Catalina on it from the list of systems to start up your computer.
- Follow the installation process when prompted.
Questions?
Do you have any questions about how to create a bootable drive for the macOS Catalina installer? Let us know in the comments.
Updated September 2019: Updated for macOS Catalina.
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You must boot your Intel® Galileo board using a micro SD card that contains the latest Intel® IoT Developer Kit version of the Yocto*-built Linux image.
Linux is the operating system that powers the Intel® Galileo board. While there is already a version of Linux built into your board, the developer-kit version of Yocto-built Linux includes even more libraries and resources to help developers create applications in their favorite programming language. This version includes GCC, Python, Node.js, OpenCV, to name a few.
In addition, sketches that you upload to the Intel® Galileo board are erased when the board is powered down. To be able to resume the sketch even after powering down your board, you must boot from a micro SD card.
Requirements
![Card Card](https://cdn.cultofmac.com/wp-content/uploads/2012/07/Screen-Shot-2012-07-25-at-12.05.39-PM.jpg)
You must have a few things to begin. The steps below are for creating a micro SD card with a Mac* OS X* host system. There are separate instructions for Windows, Mac OS X, and Linux.
Download and extract the image
This section contains steps to download and extract the latest developer kit version of the Linux image.
- Download the latest Intel® Galileo Board microSD Card Linux* Operating System Image from the Intel® Galileo Board Downloads page.
- Double-click the .bz2 file to start the extraction process.
- Wait for Archive Utility to finish expanding the file. You should now have a file called
iot-devkit-version-mmcblkp0.direct
alongside the original .bz2 file, whereversion
is eitherlatest
or a date in theYYYYMMDDHHMM
format.
Format your card
This section contains steps to format and name your micro SD card.
- Run Disk Utility, as follows:
- Go to Applications on your Mac.
- Open Utilities.
- Run Disk Utility.app.
- Insert the micro SD card into your computer.
- In the left hand sidebar of Disk Utility, select the card. In this case, the card has never been formatted before and is called NO NAME.
- Click the Erase tab.
- From the Format drop-down list, select MS DOS (FAT). In the Name field, type yocto to make it easier to identify in the steps below.
- Click Erase to confirm your settings.
- Click Erase in the confirmation message to erase the contents of your card.
- Wait for Disk Utility to finish formatting your card. It should only take a moment. Once done, you will see a card named YOCTO mounted and displayed.
Write the image to your card
This section contains steps to write the Linux image to the micro SD card.
- Run Terminal, as follows:
- Go to Applications on your system.
- Open Utilities.
- Run Terminal.app.
- Navigate to the location of the .direct file that you extracted earlier. For example, if your .direct file is on your Desktop, enter the command:
cd ~/Desktop/
- Enter the following command to list all mounted drives:
diskutil list
- Look for a drive named YOCTO. Note the disk number of the drive, which should have a name similar to disk1. Be sure not to confuse the disk name with the partition name, which should have a name similar to disk1s1.
- Use the diskutil command to unmount the SD card. Replace
#
with the disk number you noted in the previous step:
Caution: Ensure that you have the correct disk name, as described earlier. Copying and pasting the command below with the wrong disk name could result in your data being erased from the wrong drive.diskutil unmountDisk disk#
If successful, you will see an unmount confirmation message. Note: Unmounting is necessary since the following step will partition the card and copy files. - Use the dd command to write the image to the SD card. Replace
version
with the version you are using, eitherlatest
or a date in theYYYYMMDDHHMM
format. Replace#
with the disk number you noted earlier.
Caution: Ensure that you have the correct disk name, as described earlier. Copying and pasting the command below with the wrong disk name could result in your data being erased from the wrong drive.sudo dd bs=8m if=iot-devkit-version-mmcblkp0.direct of=/dev/disk#
- When prompted, type your user password and press Enter.
- Wait for the write process to finish. Please be patient as this may take up to 5 minutes. If the command is working properly, you should see flashing lights on your card reader. Once the lights stop flashing, you will see Terminal output confirming records in and out.Once the write process is complete, you will have a bootable micro SD card named Untitled with the following contents:
- Eject the card using Finder or the diskutil command in Terminal, replacing
#
with the disk number you noted earlier:diskutil eject disk#
If successful, you will see a disk ejected message.
You can now insert the card into the micro SD card slot on your Intel Galileo board. When you power up your board, the board automatically boots using the image on the card.
Now that you have created your bootable card, continue to assemble and power your board. If you want to get going quickly in Arduino, skip to installing the Arduino IDE.
For more complete information about compiler optimizations, see our Optimization Notice.