Copy an ISO to USB Drive in Mac OS with dd

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If you have downloaded an ISO image from another operating system, such as Ubuntu Linux or Windows 10, and want to convert the ISO image file to a bootable USB installation drive using a USB flash drive or USB key, you will find the most reliable way to copy or “burn” the ISO to a target USB volume. is by accessing the Mac OS X command line. There are alternative solutions, but this approach is a command line that uses dd’s, does not require downloading a third party, it is quite fast is consistently reliable to produce a bootable volumes ISO files.

It’s important to note that this is somewhat advanced and should only be used by Mac users who are completely happy with the command line. Using sudo dd has a small margin of error, and an incorrectly mentioned disk identifier can lead to permanent data loss. Because of this risk, this method is not suitable for novice Mac OS X users, but these users should take a simpler approach to using Disk Utility to burn ISO in the traditional way.

Copy an ISO file to the destination drive using a dd file in Mac OS X.

This removes the number of targets by replacing all the data in the destination drive with ISO content. There is no validation, so it is very important that you use the correct drive letter and the correct syntax to avoid deleting the wrong thing. You should back up to your Mac Time Machine before you begin.

1. Connect the destination USB drive to your Mac, if you haven’t already, then turn on the Terminal
2. Type the following command to print a list of connected drives on a Mac:

This may look something like this, it’s different on every Mac:

$ diskutil list / dev / disk0 #: TYPE NAME SIZE IDENTIFIER0: GUID_partition_scheme * 251.0 GB disk01: EFI EFI 209.7 MB disk0s12: Apple_CoreStorage 250.1 GB disk0s23: Apple_Boot Recovery HD 650.1 MB disk0s3 / dev / disk1 #: TYP9 NAMEI * GB disk1 Logical disk on disk0s2 Unlocked Encrypted / dev / disk3 #: TYPE NAME SIZE IDENTIFIER0: partition_program * 5.3 MB diskette 31: partition_map 32.3 kb disk3: 12: FAT_32 DESTINATION_DESTINATION 8.2 GB disk3 / 2 / dev / disk : TYPE

3. Find the name of the USB volume on the destination drive (“THE_DESTINATION” in this example) and note the tag (“disk3s2” in this example)



4. To remove the target space, use the following command to replace the tag if necessary:

sudo umount / dev / (SENSOR)

Again, using the example above, which is not generally applicable:

sudo umount / dev / disk3s2

5. You are now ready to format the target drive and “burn” the ISO disc to that USB volume – this deletes all the data of the destination station by replacing it with the ISO value. This cannot be undone – It is absolutely essential to target the correct identifier to avoid accidental data loss. Assuming you know what you are doing, replace the big path with an ISO so that it burns to the intended number of target tags using the following command:

sudo dd if = / path / image.iso = / dev / r (SENSOR) bs = 1m

For example, on a Windows ISO named Windows10_x64_EN-US.iso on the desktop, the syntax is as follows:

sudo dd if = ~ / Desktop / Windows10_x64_EN-US.iso = / dev / rdisk3s2 bs = 1m

Note that a ‘r’ is placed in front of the disk sensor, which makes the command much faster. The ‘bs = 1m’ at the end is for block size, which also speeds up the process. Neither of these adjustments is necessary to successfully copy ISO to a disc image, it will only result in a much faster experience.

6. When you are sure the syntax content is correct, click return and enter the administrator password, copying will begin immediately

There is no progress bar, so just wait how long the ISO copying process takes depends on many things, including the speed of the Mac, the speed of the target, and the size of the ISO file to be copied or burned.

When you’re done, you can turn off the volume, it’s ready to go.

diskutil eject / dev / (SENSOR)

What it pays for, this works by copying ISO images, which are also not boot disks and installers. For example, if you created the ISO disk yourself, you can use the script above to copy the ISO to another volume as well.

We’ve dealt with a similar dd trick, but the changes presented here make the above process faster and more reliable for some users. This method should work well on all versions of OS X, regardless of Mac.

If you know of another way to quickly convert ISO images to bootable installation volumes, let us know in the comments!

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