A macOS USB installer saves much time when you want to install the OS offline on two or more Macs. Also, it helps in recovering a system after a startup failure. It is easy to make a macOS USB disk from the full installer downloaded from the App store; Apple provides clear-cut instructions for the same. However, people use this feature only when they have a problem with their computer, mainly when their system is not booting up. Dmg dermatology. In this post, we explore the ways to make a bootable macOS USB for Catalina 10.15 and others from Windows PC and Mac.
Generally, you need to have administrator access to install Chrome on your computer. If you have logged in as a normal user without admin access then you have two options. Enter the admin details otherwise when prompted or click no button to come out of the ‘User Account Control’ popup. May 10, 2018 But, I'd like to get it accomplished without cracking open the case. Command-R won't work because the OS is too old. I'm not able to create a bootable USB media on this machine because I don't have the Administrator PW. How do I wipe the HD clean and install a new OS (El Capitan?) without physical access to the HD?
Make macOS Catalina 10.15 USB installer on Windows PC
TimeMachine is the safest option to recover a broken Mac in the offline mode. If a backup is not there, you have to go for a clean installation either from a bootable USB/DVD drive or the Internet. In my case, I lost the boot partition of my iMac and didn’t have a TimeMachine backup. Internet recovery was showing up, but it kept on failing to download the OS files from the servers. As it is my only Mac, I had no option left, until I found the method to use a Windows PC to create a Mac OS bootable USB installer. I did this for making a macOS High Sierra USB drive, and later I was successful in reinstating my iMac. As of now, the OS is Mojave, but the process given below is compatible with all editions of macOS including the upcoming macOS Catalina 10.15.
Step 1: Download macOS Catalina [DMG] for Windows
As said in the beginning, a Mac is must for creating bootable macOS USB disk. If you think about doing it from Windows, the options are limited. The cross-compatibility of extensions for the two OS are entirely different. Luckily some Windows applications support a bootable macOS disk format, DMG. Macos sierra dmg file download. Hence, If we can download macOS DMG file, then it possible build the USB installer from Windows environment.
Most of the sites talking about the bootable macOS USB installer on Windows is not guiding on how to download the required DMG files for the method. Check our page to download macOS Catalina installer installer in DMG format for Catalina, Mojave and High Sierra.
Step 2: Partition USB disk on Windows to make it bootable on Mac
Here we are creating a UBS installer for Mac on Windows. So make sure that we keep the partition of the USB disk to have an appropriate scheme. Converting the USB disk to have a GUID partition table (GTP) is recommended for this method work effectively.
Connect the USB disk to Windows and run the above-given commands in the correct order. It cleans and converts the USB disk to GUID partition table if it is using MBR or something else.
Step 3: Make bootable macOS Catalina USB installer on Windows 10
When the Internet recovery is stuck and fails to download the OS files, you could use Windows to make a bootable macOS USB installer. Out of the two or three software for handling macOS installer [dmg] in Windows, Transmac is the best one. Transmac is not free, but the developers offer a 15-day trial period, and that is sufficient for one-time use. Now let’s move on to the steps to create macOS Catalina USB disk on Windows.
Here we focus on preparing macOS Catalina 10.5 USB installer on Windows. But this method is same and applicable for Mojave, High Sierra and all previous versions up-to OS X Lion. How to boot to macOS Catalina from USB Installer made on Windows
Check the image below for macOS Catalina USB installer showing up in the boot options. In this way you could recover and restore a Mac without Internet. Some models of Macs show a prohibitory symbol when you boot from macOS Catalina recovery USB made on Windows. In that case, you need to Install Mojave or High Sierra first and then upgrade to Catalina 10.15 using the in-built software updater.
While restarting, Press the Option key on your Magic keyboard or MacBook see the boot choices. However, if you use a Windows keyboard for Mac, press the Alt key. When you see the boot menu, click on Install macOS Catalina (10.15), and proceed to the recovery process.
Alternative: Make a bootable Catalina USB installer on macOS
The recovery partition in a Mac helps in restoring it from TimeMachine or the Internet when there is a system failure. It keeps the essential apps like Disk Utility, which aids in re-installing a fresh copy of macOS. However, this partition gets deleted when you change your Macs hard disk to SSD or like. A bootable macOS USB installer comes helpful in such situations. It is also useful when you want to install macOS on a couple of offline systems without wasting bandwidth and time.
You need a macOS DMG files for making a USB recovery disk in Windows but that not the case when you have a Mac. The only thing is that you have a copy of the Install macOS app, the offline installer downloaded from the App Store. Check out the most reliable ways to macOS USB recovery disk for Catalina, Mojave and High Sierra.
Method 1: Using Terminal to make macOS Catalina USB disk
Method 2: Using a third-party app to make booatble macOS USB disk.
If you are not familiar in dealing with the Terminal app and command-line interface, consider a freeware macOS app to create the bootable macOS installer. Among the many applications out there, we prefer Diskmaker as it supports Catalina, Mojave, High Sierra, and all other macOS builds after Lion.
The latest version DiskMaker 9 compatible with macOS Catalina 10.15.
Install Dmg Without Admin Windows 7
Also, you may consider an alternative, macOS Catalina Patcher by Collin, here. The best thing about the patcher app is that it can make bootable MacOS ISO, and USB disk by downloading Catalina from the Internet, which DiskMaker do not support.
Download and create macOS Catalina USB bootable diskInstall Dmg Without Admin Free
Now, select the installation method as “Create a Bootable Installer,” and then pick the target USB disk in the next screen. Your macOS USB installer will be ready in a few minutes.
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DMG file format is one of the most well-known container format to distribute and compress software on Mac operating system. You can compare DMG files with ISO files in Windows computers. The only difference is DMG is compatible with Mac computers and ISO is compatible with Windows computers.
It is the most popular file format to install Mac or Windows operating system these days. However, if you try to run DMG files on Windows, it will not be compatible and no application in Windows can run it. Nevertheless, if you convert the DMG file to ISO file format then you can easily extract all the files from that ISO image on Windows computers.
Reasons to Convert DMG to ISO:
In this tutorial, we will show you two efficient ways to convert DMG to ISO image files so that you can run them in Windows operating system.
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Method: Convert DMG to ISO with Command Prompt
In this method, we will be combining dmd2img tool with command prompt app to convert DMG to ISO file format. It is a bit complicated but if you follow the below instructions correctly then you will surely be able to accomplish this.
Step 1. Launch your favorite browser and open http://vu1tur.eu.org/tools/
Step 2. Download the dmg2img tool by clicking on “win32 binary” link.
Step 3. After downloading the zipped file, right click on it and choose “Extract All…” from the given options.
Step 4. Now, press Shift and make a right click together on the folder where you have extracted the files to open the command prompt window.
Step 5. Click dmg2img.exe file and type the following command line on the command prompt window and press Enter.
dmg2img <source file.dmg> <destination file.iso>
For example, if want to convert a DMG file named as abcdef.dmg then type the following command line
dmg2img “C:UsersAdministratorDesktopabcde.dmg”
“C:UsersAdministratorDocumentsconvertabcde.iso”
Step 6. After you have hit enter, the file will be converter in no time.
Step 7. You may now burn the ISO image on your Windows operating system without any issue.
Conclusion –
Converting DMG to ISO could be challenging if you don’t know how to do it properly. However, in this guide we have shown two amazing ways to accomplish this without damaging the original DMG file. Remember, if you are using Mac then DMG file is enough to install apps and operating systems, but in Windows systems, you will have to convert the DMG to ISO in order to make it usable. It is suggested that you download and copy the DMG file on your Windows computer first then perform the above methods to convert it.
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