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- How To Boot With Installer Dmg On A Flash Drive Mac
- How To Boot With Installer Dmg On A Flash Drive Download
If you want to do a clean install of macOS Sierra, or you have multiple Macs to install it on, then a bootable flash drive for is your best bet for easy installation. Here’s how to make one. Apple released the new Mac OS X 10.10 Yosemite in the Mac App Store for everyone to download and install for free on October 16th, 2014, but downloading a 5+ GB file for each of your computers will take some serious time. The best thing to do is download it once and create a bootable install USB drive from the file for all of your Macs. If you can't see it, reset the PRAM and try again. If you still can't boot from the USB flash drive, verify that you created the Mac OS installer on the USB flash drive while working in the same (or as close to) current Mac OS as you intend to write to the USB flash drive. Some users have problems creating a successful bootable USB flash drive. Jun 27, 2019 A macOS Catalina USB install drive is a great tool to have on hand to for quick and easy macOS 10.15 reinstalls. We show you how in this video tutorial. Oct 09, 2013 This is better than osxdaily's method (which should only be used for DP1 anyway, not DP4 or the GM): To make a bootable USB, use this method: Your 8 GB USB drive should be called Untitled and formatted as Mac OS Extended (Journaled).
Here's how to create a bootable Windows installation USB drive starting with a Windows .iso file or a Windows Setup DVD.
Note
For new Windows 10 installations, we've got a tool that does this for you. See Download Windows 10.
What you need
- Windows 10 install .iso or DVD
- USB flash drive with at least 5GB free space. This drive will be formatted, so make sure it doesn't have any important files on it.
- Technician PC - Windows PC that you'll use to format the USB flash drive
- Destination PC - A PC that you'll install Windows on
Step 1 - Format the drive and set the primary partition as active
- Connect the USB flash drive to your technician PC.
- Open Disk Management: Right-click on Start and choose Disk Management.
- Format the partition: Right-click the USB drive partition and choose Format. Select the FAT32 file system to be able to boot either BIOS-based or UEFI-based PCs.
- Set the partition as active: Right-click the USB drive partition and click Mark Partition as Active.NoteIf Mark Partition as Active isn't available, you can instead use diskpart to select the partition and mark it active.
Step 2 - Copy Windows Setup to the USB flash drive
- Use File Explorer to copy and paste the entire contents of the Windows product DVD or ISO to the USB flash drive.
- Optional: add an unattend file to automate the installation process. For more information, see Automate Windows Setup.
Step 3 - Install Windows to the new PC
- Connect the USB flash drive to a new PC.
- Turn on the PC and press the key that opens the boot-device selection menu for the computer, such as the Esc/F10/F12 keys. Select the option that boots the PC from the USB flash drive.Windows Setup starts. Follow the instructions to install Windows.
- Remove the USB flash drive.
Troubleshooting: file copy fails
This can happen when the Windows image file is over the FAT32 file size limit of 4GB. When this happens:
How To Boot With Installer Dmg On A Flash Drive Mac
- Copy everything except the Windows image file (sourcesinstall.wim) to the USB drive (either drag and drop, or use this command, where D: is the mounted ISO and E: is the USB flash drive.)
- Split the Windows image file into smaller files, and put the smaller files onto the USB drive:Note, Windows Setup automatically installs from this file, so long as you name it install.swm.