Booting Os's


Set up USB drive with single ISO

The ubuntu walk through work for most linux derivative.

The process uses Etcher which does not support writing to a partition of a given drive

Set up USB drive with multiple ISO's

  1. partition the drive
  2. unmount the partition we wish to write to

The most direct solution to this is to use the terminal.


Assumes disk is partitioned, formatted and ISO's are downloaded.

  1. identity target disk identifier: diskutil list
  2. unmount target: diskutil unmount disk3s8
  3. flash or burn iso to partition
 sudo dd if=<path-to-iso>/ubuntu-21.04-desktop-amd64.iso of=/dev/rdisk3s9 bs=4m

There is no progress bar so just wait it out, how long the ISO copy process takes depends on a variety of things, including the speed of the Mac, the speed of the target volume, and the size of the ISO file being copied or burned to the destination.

Partition usb

A usb drive can be partition from diskutility

navigate to view and "show all devices"

Command Reference

diskutil list

unmount disk

sudo umount /dev/<identifier>


diskutil unmount /dev/<identifier>

diskutil unmount /dev/disk3s9


diskutil unmountDisk /dev/disk3



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