oselite.blogg.se - How to create a bootable usb mac os sierra

Option 2 – Manually – Creating macOS Install Media as a DMGĪs with option 1, we of course first will need to download the right file from the Apple App Store. Sudo /Applications /Install\ OS\ X\ El\ Capitan.app /Contents /Resources /createinstallmedia -volume /Volumes /MyUSBDrive -applicationpath /Applications /Install\ OS\ X\ El\ Capitan.app Note: Here I describe how to create macOS install media, either as a bootable USB stick to do a fully clean macOS install for your Mac, or a DMG file, for example to setup a virtual machine. a DMG or ISO file) so you can install another version of macOS. This comes with challenges though, since Apple, in their infinite wisdom, does not simply provide macOS install media (eg. Some of my favorite tools simply no longer work, and as a developer this makes me nervous when considering switching to the latest and greatest.įor this purpose I always create a virtual machine in VMWare Fusion, running the macOS version that I ran before the update. For some it’s nothing, for other it’s a disaster.Ĭatalina is one of the latter, a disaster for quite few amongst us, due to changed security rules and the lack of support of 32 bit applications. Boot the device that you want from the USB stick.In this article, I’ll show you the steps to create macOS install Media …Īs most Mac users will know each new macOS version comes with a few challenges.

Run diskutil eject /dev/diskN and remove your flash media when the command completes.

Start the 'Disk Utility.app' and unmount (don't eject) the drive. Note: If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Use the same command but replace bs=1m with bs=1M. Note: If you see the error dd: Invalid number '1m', you are using GNU dd. Note: Using /dev/rdisk instead of /dev/disk may be faster.

Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located for example.

Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command - in the previous example, N would be 2).Run diskutil list again and determine the device node assigned to your flash media (e.g.

Run diskutil list to get the current list of devices.dmg ending on the output file automatically. Hdiutil convert -format UDRW -o /path/to/target.img /path/to/source.iso Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight).Tip: Drag and Drop a file from Finder to Terminal to 'paste' the full path without typing and risking typos. img file that you will be required to create from the.

This quick step by step will show you how to make a bootable USB stick from a downloaded ISO image file using an Apple Mac OS X.