9/24/2019 Bootable Usb Install For Mac Poweriso
UPDATED 12/2/18: It doesn’t matter whether you’re a macOS Sierra or a Windows 10 user, it’s just a matter of time until your device refuses to boot, which could be for a number of reasons, including file corruption, hardware failure, buggy update, etc. If the unexpected happens with Apple computer, you can use a macOS bootable USB with the installation media to repair it.
This is one of the main reasons why you should always consider making a macOS bootable USB when your device is working properly. However, if it happens that none of your devices (MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro or Mac Mini) are not working when you need them the most, then you can use a Windows PC to rescue your Apple device. You can use a Windows 7/8.1, or a Windows 10 PC to quickly make a USB bootable installation media to reinstall macOS Sierra on your Mac.
Create a bootable USB Installer with Install Disk Creator and boot from it. Erase the startup disk and install macOS onto it. Boot up from this newly created startup disk. Note: The Finder’s built-in “Copy” and “Paste” will not work for the following. How to write a USB stick with macOS. How to write a USB stick with macOS.
In this, you’ll learn the steps to make a macOS Sierra bootable USB installation on Windows 10, which you can use to reinstall or upgrade Apple’s OS. Things to know before proceeding Before you dive into this guide, you’ll need a few things:. A broken Mac computer with Mac OS X or (version 10.12 or later).
A trial copy of the TransMac software. One high quality USB flash drive with 16GB of storage. A copy of Apple’s macOS (DMG file).
How to make a macOS bootable USB installation media To create a bootable USB drive with the latest version of macOS, do the following:. This is a paid software, but it gives you a 15-day trial, which is more than enough time. (If this works for you and want to support the developer, you can purchase the full version.).
Connect the USB flash drive you want to use to fix your Mac. If you have any data on the USB, remember to make a backup, as everything on it will be erased. Right-click TransMac, and select Run as administrator.
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If you’re using the trial version, wait 15 seconds, and click Run. On the left, right-click the USB flash drive, select Format Disk for Mac.
You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. If this is the case, chances are that it’s using a MBR partition, and the USB drive needs a GPT partition to work on a Mac. On the warning message, click Yes to format the drive.
Enter a name for the drive, such as “macOS bootable USB” and click OK. Click Yes to confirm. If the formatting completed successfully, click OK to continue. Right-click the USB flash drive, and select Restore with Disk Image. On the warning message, click Yes to confirm the data on the USB drive will be erased.
Click the browse button on the right, locate the.dmg file with the macOS installation files. Click Open. Click Yes to create the macOS USB bootable media. Once the process completes, you can now insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest version of macOS, which can be Sierra or later. How to create a GPT partition on a USB flash drive If the USB flash drive is not working using TransMac, it could be still a partition problem.
In this case, you want to redo the entire process again, but this time use the following steps to use the Diskpart command-line utility on Windows to create the appropriate GPT partition. Open Command Prompt as an administrator. Type the diskpart command and press Enter. Enter the list disk command to view all drives connected to your computer and press Enter. Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter.
Enter the clean command and press Enter. Type the convert GPT command and press Enter. Enter the create partition primary command and press Enter to complete the process. Once you formatted the USB flash drive to a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time skip the steps 5 through 9, and continue on step 10.
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. Booting from a USB stick is nowadays more and more important. More and more PCs (and servers) are delivered by default without a CD/DVD drive. To install the OS of your choice, USB sticks provide you the easiest possibility. In fact, it can even work out cheaper than burning a CD or DVD that you just throw away once the version is outdated. For most Linux distributions the ISO for burning a CD/DVD is available freely on the internet. In this post I’ll assume you have already downloaded the bootable ISO image for the OS of your choice, but how to get the ISO image onto the USB stick?
Advertisements The ISO file you have downloaded contains an image of the entire media. It includes all the files necessary to boot your PC/server. This image format is sadly not directly usable to copy onto the USB stick. We first need to convert the image from an ISO to a UDRW (Read/Write Universal Disk Image Format) which we can copy to the USB stick. Some of the steps to create a bootable USB stick could be done in the GUI as well, but as some of them can’t and you have to go to the shell anyway, I decided to do all of the steps in the shell.
Convert the ISO to UDRW format Mac OS X provides all the tools needed to convert the ISO image to UDRW. The following command will convert the ISO image to the UDRW format. Hdiutil convert -format UDRW -o destinationfile.img sourcefile.iso You will notice that the destinationfile.img from the command will create the file destinationfile.img.dmg really.
This is because the hdiutil program automatically adds the dmg file extension. This is not a problem as the file extension won’t affect the format of the image.
Prepare the USB stick Check your USB stick and make a backup if there is any important data on it, as the next steps are going to delete everything on it. To prepare the USb stick we are going to delete all the partitions on the stick and create an empty partition. To do this we need to know the device name of the USB stick. Open a terminal and execute the following command: $ diskutil list You will see a list of disks and partitions. The goal is to identify the USB stick in this output. Depending on your system configuration your output might look different from this one.
This appears to show 3 physical discs but it does not. The /dev/disk1 is a virtual disk created because of the partition encryption I enabled in Mac OS X.
/dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUIDpartitionscheme.500.1 GB disk0 1: EFI 209.7 MB disk0s1 2: AppleCoreStorage 399.5 GB disk0s2 3: AppleBoot Recovery HD 650.0 MB disk0s3 5: AppleBoot Boot OS X 134.2 MB disk0s5 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: AppleHFS MacOSX.399.2 GB disk1 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: GUIDpartitionscheme.2.0 GB disk2 1: Microsoft Basic Data UNTITLED 1 2.0 GB disk2s1 As shown in the output above, the connected USB stick is a small 2.0 GB drive with a FAT partition on it. We are now going to remove this partition in the next step.
For the following steps we will need the name of the disk which in this case is “/dev/disk2”. With the following command the data on the disk (your USB stick) will be deleted! $ diskutil partitionDisk /dev/disk2 1 'Free Space' 'unused' '100%' With this command the USB stick was re-partitioned to have 1 partition without formatting and 100% of the size of the stick. If you check it again with “diskutil list” you will see the changes already, also the USB stick will no longer be shown in the Finder. Copy the image to the USB stick Now we can copy the disk image we created to the USB stick. This is done via the command. This command will copy the image to the disk (substitute the appropriate disk name for your USB stick here, as with the re-partitioning command): $ dd if=destinationfile.img.dmg of=/dev/disk2 bs=1m The dd command does not show any output before it has finished the copy process, so be patient and wait for it to complete.
$ diskutil eject /dev/disk2 To eject the USB stick, use the above command. After this is done, the bootable USB stick is ready to be used. Read more of my posts on my blog at. Thanks to John for pointing out some slightly different behaviour in Mac OS X 10.9 (Mavericks). While Mac OS X 10.7 (Lion) allows you to execute the “dd” command with your user priviledges, Mavericks does not.
So if you are using Mavericks and get the “Permission” error, the solution is to use sudo. Sudo allows you to run the “dd” command with root priviledges. While the root user is disabled in Mac OS X by default, sudo is allowed for users which have the “Allow user to administer this computer” option set. When using sudo as shown below, you will be asked for your password to proceed. $ sudo dd if=destinationfile.img.dmg of=/dev/disk2 bs=1m Please keep in mind that after you have entered the password, the dd command does not show any output. So please be patient until the dd command has finished.
Thanks again to John for pointing this out!
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