How to Copy an ISO to a USB Drive in Mac OS with dd

Copying an ISO image file to a USB drive in Mac OS X can be done using the dd command in the Terminal. This method is reliable and fast, but it requires some command line knowledge. If you’re comfortable with the command line, follow these steps to copy an ISO to a USB drive:

Step 1: Connect and Identify the USB Drive

Connect the USB drive to your Mac and open the Terminal. Use the command “diskutil list” to view a list of connected drives. Identify the USB volume name and the corresponding disk identifier (e.g., disk3s2).

Step 2: Unmount the Target Drive

To prepare the USB drive for formatting, use the command “sudo umount /dev/(disk identifier)” (e.g., sudo umount /dev/disk3s2).

Step 3: Format and Copy the ISO

Use the command “sudo dd if=/path/image.iso of=/dev/r(disk identifier) bs=1m” (e.g., sudo dd if=~/Desktop/Windows10_x64_EN-US.iso of=/dev/rdisk3s2 bs=1m) to format the USB drive and copy the ISO content to it. Make sure to replace “/path/image.iso” with the path to your ISO file.

Step 4: Complete the Copying Process

Confirm the command syntax and enter your administrator password. The copying process will begin. Please note that there is no progress bar, so you’ll need to wait until the process completes. Once done, you can safely eject the USB drive using the command “diskutil eject /dev/(disk identifier)” (e.g., diskutil eject /dev/disk3s2).

Remember, this method should only be used by experienced Mac users who are comfortable with the command line. Make sure to verify the disk identifier and syntax to avoid data loss. If you’re not confident, it’s best to use Disk Utility or seek alternative methods.

Benefits of Copying ISO to a USB Drive in Mac OS X with dd

  • This guide is free and provides helpful instructions for Mac users.
  • It allows users to create bootable USB installation drives.
  • The dd command is fast and reliable for copying ISO files.


Q: How does this guide help in copying an ISO to a USB drive?

This guide provides step-by-step instructions for using the dd command to copy an ISO file to a USB drive in Mac OS X.

Q: What devices and operating systems are supported?

This method is supported on Apple devices running Mac OS X.

If you have any further questions or need assistance, feel free to ask in the comments or contact us directly. Please note that this guide is for educational purposes only and any corrections or alternate methods can be communicated to us through our contact page.

Editorial Staff
Editorial Staff
The Bollyinside editorial staff is made up of tech experts with more than 10 years of experience Led by Sumit Chauhan. We started in 2014 and now Bollyinside is a leading tech resource, offering everything from product reviews and tech guides to marketing tips. Think of us as your go-to tech encyclopedia!


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