How To Make A Bootable Usb For Mac Osx Using Poweriso
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.
How To Make A Bootable Usb For Mac Osx Using Poweriso
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.
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 truethen, 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!
Hit the Options button under the partition table and choose "GUID Partition Table". You'll need this to make the drive bootable on a Mac. Hit the Apply button when you're done to format your drive (note: it will erase everything on the drive).
Since Windows doesn't offer native support for DMG files, you can first convert the file to ISO. Why? A lot of easier to find an app for making a bootable USB from ISO file. The easy way to do this is to use Command Prompt. Don't be intimidated by the non-GUI environment even if you don't have any experience. If you follow the steps below, you can convert any DMG file to ISO and then create a bootable USB using the converted file.
To create a bootable USB drive from a DMG file on Windows, you will need to have the right utility. That's because DMG is not native on Windows. It is the Mac equivalent of an ISO file that has been in use since Apple transitioned from the IMG format with Mac OS X. A DMG file, like ISO, can be used to install macOS operating system or Mac apps. If the Mac computer was broken or crashed and couln't get into the system, but you only have access to a Windows PC, there's still a way to make a bootable macOS install USB on Windows.
This article looks at three applications that you can use to create a bootable USB drive from a DMG file in Windows. All of them have their advantages and disadvantages, which we have highlighted. You can make the best choice for you based on the information provided below. They are in no particular order of preference.
It is not easy to find an user-friendly application when it comes to make bootable macOS Install USB. That's the reason why we spent months to develop such an app. Our latest product, DMG Editor, is a fairly robust application for creating bootable USB from a DMG file. And it works well on both Windows and Mac platforms.
Did you make a macOS Monterey boot installer? Did you use one to update to macOS Monterey? What do you use the bootable installer drive for? Let us know your thoughts, tips, and experiences in the comments.
I'll demonstrate how to "burn" various bootable Mac OS 9 CD images (but you could use this tutorial for any Mac OS version really) onto an USB stick using the free, simple and super useful HDD Raw Copy Tool under Windows. You can also achieve what's described in this article under Mac OS X using the Terminal. Using this software, I successfully booted my DV+ G3 iMac from summer 2000 from a .TOAST CD image made with Roxio Toast under Mac OS 9, a .DSK hard drive image made with QEMU, an .ISO CD image from a real Mac OS CD dumped with PowerISO and even a .IMG hard drive image made with SheepShaver... all of them individually burned onto my old 4GB USB stick.
Some versions of Mac OS 9 install disks will refuse to boot (and/or install) from an unlocked drive (such as an USB stick) as it was supposed to be a copy protection scheme (I guess)... so to overcome this, I suggest that you boot from an already installed Mac OS 9 system folder. You could make one yourself using an emulator (SheepShaver or QEMU) and on that disk image, you could also put various useful tools for mounting disk images, expanding archives (DiskCopy, Toast, Stuffit Expander, etc...) and while you're at it, you could also copy that Mac OS 9 CD image as is on the same disk. Once you're booted off of this already installed Mac OS 9 disk image you made, lock and mount the Mac OS 9 CD image file and launch the installer from there, which will enable you to install Mac OS 9 onto your Mac's hard drive without a hitch. If this sounds like too advanced or time consuming for you, then just grab my own Mac OS 9.2.2 bootable USB stick disk image here and boot your PowerMac with it :P
Before you begin, if your disk image is zipped or compressed, make sure to expand/uncompress it first. This software does not take ZIP files, it only takes the uncompressed disk image (.iso, .dsk, .toast, etc... not .zip, .sit, .7z, etc...). Also, you CANNOT directly write DMG images, because they are compressed. So, if you want to write a DMG image, you have to convert it to ISO first. You can do that using PowerISO in 5 seconds: Open the DMG file in PowerISO, then select TOOLS menu > CONVERT... and then in the "Convert" window that will appear, make sure you tick the ISO checkbox, set the destination save file path and hit OK to save the ISO file.
Note: If you need instructions on how to boot an old G3 or G4 Mac using that USB stick with the help of Open Firmware then make sure to read/follow the article that explains that procedure.
The applications are endless. You might use a bootable USB to do a system recovery in an emergency or store a backup image of your disk drive. Or you might take it with you so you always have access to your favorite OS and applications, even when you're using an unfamiliar computer.
UltraDMG is a great tool that can seamlessly write DMG file to USB drive with the booting information and make it bootable. It's a fast and effective way to create a macos bootable installation drive. Apart of the DMG burning option, it also provides "Extract" option which allows you to extract any files and folders from DMG file to computer. In the aspect of software usability , for those users who are not particularly tech-savvy, WonderISO has eliminated the hassle of performing lengthy and confusing steps. This is a third-party tool which can do the job both on Windows and Mac OS. It can not only burn DMG files to USB, but it can burn various other files formats like ISO, RAW, IMG, ZIP, BZ2, etc. It supports multiple disk image burning at the same time, which is quite unusual. Regular software updates are available from time to time. For your queries, professional team for customer support is available.