Install Mac Os Catalina On External Ssd

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Disk Utility User Guide

In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. Erasing a storage device deletes everything on it.

(macOS used to be called OS X.) If you have only the Catalina installer on your Mac, Install Disk Creator will automatically select it. If you have other macOS installers, you need to click on Select the OS X installer and select the Catalina installer. Install Mac Os On External Drive From Windows. When you’re ready, click Create. Step 6 How to use Internet Recovery to install macOS to a new SSD. 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,. Maybe you want to troubleshoot some problems, repair the disk, do partitions, format the entire disk, update, and install OS X etc. All these are executed perfectly when you use an external boot volume to boot up your Mac. In this article, we are here with the detailed step by step guide on how to boot Mac from external hard drive easily. Factory OS on my iMac was High Sierra, file system of my external SSD is Mac OS Extended. I wanted to update to Mojave but then I learned that there are some issues, because Mojave needs APFS file system, and because of that computer with external SSD can work and boot slower.

  1. If you have any files you want to save, copy them to another storage device.

  2. Open the Disk Utility app on your Mac using one of the following methods, depending on the type of disk or volume you want to erase:

    • If you want to erase your startup disk: Start up from macOS Recovery, then choose Disk Utility from the Recovery window.

    • If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.

  3. Choose View > Show All Devices.

  4. In the sidebar, select the storage device you want to erase, then click the Erase button .

  5. Click the Scheme pop-up menu, then choose GUID Partition Map.

  6. Click the Format pop-up menu, then choose a file system format.

  7. Enter a name.

  8. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK.

    Secure erase options are available only for some types of storage devices. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device.

  9. Click Erase, then click Done.

Note: With a solid-state drive (SSD), secure erase options are not available in Disk Utility. For more security, consider turning on FileVault encryption when you start using your SSD drive.

See alsoPartition a physical disk in Disk Utility on MacFile system formats available in Disk Utility on MacPartition schemes available in Disk Utility on MacFormat a disk for Windows computers in Disk Utility on MacApple Support article: How to erase a disk for Mac

Oct 02, 2017 Once the drive has been formatted, quit out of Disk Utility which returns to the macOS Utilities screen. 4: Install macOS High Sierra. Back at the macOS Utilities screen, choose “Install macOS” to install a new copy of macOS High Sierra. This will be the clean macOS install onto the freshly erased hard drive. Sep 25, 2018 Put the macOS Mojave installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac. By Roman Loyola Senior Editor Macworld Sep 25, 2018 3:30 am PDT.

If you want to do a clean install of macOS Sierra, or you have multiple Macs to install it on, then a bootable flash drive for is your best bet for easy installation. Here’s how to make one. Nov 15, 2020 macOS Big Sur running list of install / upgrade problems. This article is a running list of all known macOS Big Sur install / upgrade issues. MacOS Big Sur launched on Thursday November 12th, 2020. As with any launch of a product or software there will be issues. In the case of Big Sur, the problems started almost immediately. A macOS Catalina USB install drive is a great tool to have on hand to for quick and easy macOS 10.15 reinstalls. We show you how in this video tutorial.

Mac

An external drive that you can use as an installer for macOS Catalina is a handy thing to have. If you have multple Macs to upgrade, it’s a lot more efficient to plug in the USB installer drive and run the installer than to log into the App Store, download the 8.09GB OS installer, and then run it.

In this article I’ll go over the different ways you can create a bootable macOS Catalina installation drive. But before I give instructions on how to create the drive, I’ll go over the items you’ll need and how to get them.

Get an external drive and maybe an adapter

The macOS Catalina installer software is over 8GB, so you need a USB external drive that can hold that much data. The drive can be a thumb drive, hard drive, or SSD.

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If you have a 2015 or newer MacBook or a 2016 or newer MacBook Pro, you may need Apple’s $19 USB to USB-C adapter. This will allow you to connect a storage device that uses a USB type-A connector. If you don’t have an external drive and you have a USB-C Mac laptop, you could buy the SanDisk Ultra USB Type-C Flash Drive, which has a USB-C connector. You can get model number SDCZ450-016G-G46.

How To Install Macos Catalina On New Ssd

When creating the boot drive, the storage device is reformatted, so there’s no need to format the drive beforehand.

Get the macOS Catalina installer software

The macOS Catalina installer is available in the App Store. If you launch the App Store app, do a search for “Catalina.” Or, if you click this Catalina App Store link, it will take you to the Catalina App Store webpage, then click on the “View in the Mac App Store” button.

External

You can read the information to learn more about Catalina. When you’re ready to download the software, click the Download button. (If you’ve already downloaded the installer, the button will say Install instead of Get.)

Once the download is complete, the installer will launch automatically. But don’t continue with the installation. Instead, press Command-Q on your keyboard to quit the installer.

The Catalina installer app will be in your Applications folder, so you can go there and launch it later to upgrade your Mac to the new operating system.

Make a bootable installer drive: The quick way

I used a free app called Install Disk Creator to make the installation drive. Download Install Disk Creator by clicking on the link. When the download is done, you can move it over to your Applications folder. Then follow these steps to create your bootable macOS Catalina drive.

1. Connect your drive to your Mac.

2. Launch Install Disk Creator.

3. In the main window, you’ll see a pop-up menu under Select the volume to become the installer. Click on the menu and select your drive.

4. Under the pop-up menu, you’ll see Select the OS X installer. (macOS used to be called OS X.) If you have only the Catalina installer on your Mac, Install Disk Creator will automatically select it. If you have other macOS installers, you need to click on Select the OS X installer and select the Catalina installer.

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5. When you’re ready, click Create installer. Your Mac may tell you that Install Disk Creator wants to make changes, and you need to enter your user name and password. After you do this, the app will take a few minutes to create the boot drive. A progress bar. appears at the bottom of the Install Disk Create window.

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If you try to start the process and you get a failure message saying that the drive couldn’t be unmounted, try reformatting the drive first as ExFAT using Disk Utility. Then start the process over again.

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When the app is done, the installer is ready to use.