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#What cleaner can i use with mac os sierra how to#
#What cleaner can i use with mac os sierra install#
#What cleaner can i use with mac os sierra update#
#What cleaner can i use with mac os sierra download#

Hold down “Command-R” (hold down both the “Command ⌘” and “R” keys) when you start the Mac to launch macOS Recovery.

To allow booting from the USB flash drive, do the following: Attempting to boot from a USB flash drive will result in a “Security settings do not allow this Mac to use an external startup disk” warning message.

On a newer Mac with the T2 security chip, booting from an external drive may be disallowed by default. Sometimes the progress bar may appear to be frozen or the screen will go black for a minute or two. It may take 5-10 minutes to load the installer from the USB flash drive.

Select the “Install macOS Catalina” (with left/right arrow keys) and hit the “return/enter” key to boot from the USB flash drive.

The USB flash drive should then appear after a few seconds.

Note: If you don’t see the USB flash drive’s “Install macOS Catalina”, try removing and re-inserting the USB flash drive while viewing the Startup Manager screen.

(The internal hard drive may not be visible if it does not have a valid, bootable partition installed.)

You should see one or more icons, one of which should be called “Install macOS Catalina” for the USB flash drive.

While holding the “option” key down, turn on the Mac to display the Startup Manager.

Unfortunately, the “Startup Disk” did not list my USB flash drive as a startup option, so I was not able to use this method. Then on restart, the Mac should boot from the USB flash drive.

#What cleaner can i use with mac os sierra how to#

Note: Apple’s How to create a bootable installer for macOS page suggest using the “Startup Disk” configuration (under “System Preferences”) to select the USB flash drive as the startup drive. The above process took 20-30 minutes using my Kingston USB 2.0 flash drive.

#What cleaner can i use with mac os sierra install#

Install media now available at "/Volumes/Install macOS Catalina" To create a bootable USB macOS Catalina installer, run the “Terminal” application and this command:Įrasing disk: 0 %. (USB 2.0 and large capacity drives may take longer.) After the format completes, the partition will be mounted under “/Volumes/Catalina” (or whatever name you selected above).

The format operation may take several minutes to complete.

Click the “Erase” button in the warning popup dialog if you get one.

Click the “Erase” button at the bottom.

If available, select “Master Boot Record” for “Scheme”.

Select “Mac OS Extended (Journaled)” for “Format”.

Input a name like “Catalina” (this name will be overwritten later).

Click on the “Erase” tab (or button at the top).

On the left-hand pane, select the USB drive (not the partition under it, if any).

Plug the USB flash drive into your Mac.

If the USB flash drive is not already formatted as “Mac OS Extended (Journaled)”, format it like so: You don’t need to delete the existing content on the drive because we will blow it all away in a subsequent step. For example, you can move the “Install macOS Catalina” application to the “~/Downloads” directory and run it from there.īecause macOS Catalina is 8.4GB in size, you will need a 16GB USB flash drive.

#What cleaner can i use with mac os sierra update#

Note: If you plan to run the installer first to update your current macOS version to Catalina, you will want to move the “Install macOS Catalina” application out of the “/Applications” directory otherwise, the installer will delete itself from the “/Applications” directory when the upgrade completes. If the installer automatically launches, just close it. It will be saved to the “/Applications/Install macOS Catalina” location.

#What cleaner can i use with mac os sierra download#

Go to the Mac App Store, search for “macOS Catalina”, and download it. (The Mac mini came with macOS 10.14 Mojave so I used it to download Catalina.) You will need a Mac to download macOS Catalina you can download Catalina from The Mac Go. Note: The instructions below are the same for macOS 10.13 High Sierra and macOS 10.14 Mojave. I purchased a used 2018 Mac mini desktop and wanted to put a fresh installation of the latest macOS 10.15 Catalina on it.