How To Create A Bootable Usb Drive For Mac Os X Sierra With Windows
Maggie Schnair
Summary: This guide offers step-by-step instructions to create a macOS bootable USB on Windows 11, 10, 8, or 7. Give it a try if you need to create a macOS Monterey, High Sierra, or Catalina bootable USB on Windows.
Having a macOS bootable USB installer is valuable, especially when your Mac can't start up or you need to install macOS on your Mac or Windows PC. If you don't have a working Mac, you can create a macOS bootable USB on Windows with the steps in this article.
How To Create A Bootable Usb Drive For Mac Os X Sierra With Windows
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In this section, we'll give detailed instructions on how to create a macOS bootable USB on Windows. Please note that your Mac can't boot from a macOS version older than the one it shipped with. In other words, if your Mac came with macOS Catalina, it won't boot from a macOS High Sierra bootable installer.
No, Rufus can't make a macOS bootable USB. It's only able to create a bootable installer for Windows. If you need to create a macOS bootable USB from a Windows computer, you would typically use tools like TransMac or similar software.
If the USB flash drive is not working with TransMac, it could still be a partition problem. In this case, you may need to redo the entire process. However, this time, you should follow these steps to use the Diskpart command-line utility on Windows 10 (or 11) to create the appropriate GPT partition, and then follow the above instructions.
Once you have formatted the USB flash drive with a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time, skip steps 5 through 10 and continue on step 11.
According to the first answer here, -a-bootable-usb-drive-from-a-dmg-file-on-windows, there's a tool with a free trial called TransMac that can do it. Just make sure the USB drive is formatted with GPT and not MBR.
What might be easier, however, is that that model has support for Internet Recovery. If you boot holding Command-R and you have a WiFi connection, it can actually boot into recovery mode without a recovery partition on a drive (or even without a working drive).
I know this question is old but it is still valid. I was never able to write a Mac installer image to my Flash Drive and have it bootable, unless I did it on a Mac. Using Michael D. M. Dryden's Link, I was able to use the Diskpart command to clean and prep a GPT partition on a flash drive for an OSX Mavericks install image.
I used TransMac on Windows 7 to restore the image file I had to the Flash Drive, it created a bootable Mac image on my flash drive. Someone had reported that the method for using DISKPART did not work, but I have done this twice and it works remarkably well, and it's the only method I could find to create a Mac-Bootable Flash. I've been trying to post this to confirm that it works for some time, I just hope it helps someone else, because it is a very easy solution.
Note: I use "Rufus" for all other USB writing and formatting for Windows systems, it's a great app, but I had previously tried to format the drive as GPT using that, as a Fat32 partition. When I tried to inject the image, Transmac told me that the drive was "write protected". So basically, the USB drive cannot have any high level formatting, the Windows system should detect the drive as "not formatted" for this to work, which it will if prepped right with Diskpart.
Internally, the BaseSystem.dmg Mac disk image file contains a drive that is using the Apple Partition Map (APM), which is not well supported in a Windows environment. This step creates a GUID Partition Map on the USB flash drive instead of copying the APM from the BaseSystem.dmg file. Once the partition is created on the USB flash drive, the HFS volume image stored in the 3.hfs is copied to this partition.
Open the Paragon Partition Manager 17 CE application. Select to resize the partition with the Apple HFS volume on the USB flash drive to maximum size, as shown below. Next, select the "Change now" button. When finished, select the "Close" button.
In fact, there are very few ways that can be used to write DMG image file to a USB drive and have it to be bootable on a Windows computer. As far as i konw, some third party tools like Transmac, poweriso, etcher or sysgeeker's WonderISO.but none of them are free, I suggest you download the trail version and use it for 3 times without paying.
I had this problem with a friend computer, it was an old iMac and I'll tell you it is not going to be easy.
The first thing you have to do is make sure what model you have (the year when your computer has been released) then check on the official apple website to see what is the latest macOS or Mac OS X version available for you computer.
In most of the new mac computer, you can just press cmd+r while booting and the mac will automatically download everything you need to install the system, but the oldest does not have this tool.
In this case, you have to download the dmg file, that can be found on the web, for example, one websites that provides some macOS and Mac OS X is this (for El Capitan, if you need another version, I'm sorry but you have to search for it).
Here things start to get a little tricky.
First of all you have to flash the image on a USB drive, I recommend etcher, that works on everything (Mac, Linux and Windows too) it's extremely easy to use and you just need to select the drive and the image and etcher will do everything by itself, plus it's free here.
When the USB drive is ready you can plug it in you mac and press alt (option) while booting, you have inserted a firmware password, it will ask you to unlock the firmware by inserting that password, else it will take you to all the bootable drives, including your USB device.
If you see the mac logo with a stop icon over it, it means that you downloaded a too new version that is not supported from your mac, else it will start.
When it start, it won't install, saying that the system can't verify the downloaded image, that's why you have to navigate on the "utilities" menu on the top bar and open the terminal.
Now you have to choices, change the date & time, which can work, but may not.
That's basically because every image of mac has a certificate that can expire, so, if the certificate is expired you won't be able to make it work, unless you change the date (the date is different from mac version to mac version, so based on that you have to change it, usually just search for when was that version released and se the current date to that date or even one or two days later to make it work). Then try to install the system, if this does not work again, you can start the installation without verifying the image, but you should really trust the image you're using from being corrupted or modified (just to make sure the download went right, use the SHA-1 code to make the file has been downloaded right).
So, to proceed without verifying the image, from terminal, type in this command: sudo defaults write com.apple.frameworks.diskimages skip-verify true
then, start the installation. (Is possible that you won't need the sudo at the begin, in that case just remove it from the command and start from "defaults")
Now you should be able to install macOS from a USB drive...
Just a little thing, make sure to have formatted the disk before proceeding, I would recommend to make a partition that takes the whole disk in mac Journaled format, then if you want you will be able to encrypt the disk (the installer will ask you to do that later), instead, if the disk was encrypted before, you will have to insert the encryption key of the disk to continue the installation process.
Really hope this help, I spent a lot of hours to do this on a really old iMac from 2008... and now it works!
Good luck!
For those who failed to create bootable USB with TransMac, take a look at UUByte DMG Editor. I managed to create two bootable USB from macOS Mojave and Catalina DMG file and successfully installed them on respect Mac.
I've tried many tutorials on how to create a mac bootable USB drive from Windows but none of them worked. So, I've come up with my own solution that worked fine with any DMG I've tested. Please find the details on my github page.
where disk2 is the usb drive id known in the prior command and "WINDOWS10" is the volume label (to be used later).
Please double check this step, or you could delete all data in another drive.
Then mount your image with:
that's because the install.wim file is larger than 4GB, too large for your just created FAT32 partition in your USB stick (back in the day I originally posted this answer, probably the file wasn't that big). In this case, you will need to slipt it and copy it with the Windows Imaging libraries. So, using Homebrew install them with:
Since macOS Sierra this is no longer normally possible, though you can alter* Bootcamp to reinclude this option.Alternatively, you can create a bootable USB using the terminal, or using an application like UNetbottin.
You can find instructions for how to use the UNetbottin here, and for using the terminal or reincluding the option in Bootcamp here*.
Having tried all the available tools and generating 10s of unbootable Sticks, I finally created a Linux/Ubuntu bootable stick, which was trivial, and then, using the live Linux, created a bootable Windows USB Stick in no time.
You cannot alter info.plist if you are booted from the same hard drive. You'll need a second partition with MacOS X installed. in my case I have two partition with High Siarra installed on both partition. and boot from the one you don't want to alter. in my case my second HDD.
The main problem with the windows 10-Iso is an embedded file that is too large for FAT32. You need FAT32 though (i have heard, other methods with NTFS are possible but i can't confirm that, since it didn't work for me)
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