Creating bootable USB images on the MacFri, Mar 27, 2015
Creating a bootable image for installing a Linux OS is pretty straight-forward but when you are doing this on the Mac there is a specific way it needs to be done. I alway use USB drives for this purpose so what follows are the steps needed to create a bootable USB stick from a Linux .iso image.
I presume you have already downloaded your favourate Linux distribution in .iso format, below I’m using Debian Jessie.
First conver the .iso image into a .img image.
$ hdiutil convert -format UDRW -o debian-jessie-DI-rc1-amd64-netinst.img debian-jessie-DI-rc1-amd64-netinst.iso
You then need to find your USB drive.
$ diskutil list
Look for USB device. I’ll use /dev/disk7 for this example. First make sure it is unmounted.
$ diskutil unmountDisk /dev/disk7
Then copy the image to the USB stick. CAUTION This will overwrite anything that is already on the drive.
$ sudo dd if=debian-jessie-DI-rc1-amd64-netinst.img.dmg of=/dev/disk7
Safely eject the USB disk before using it for booting on your target device.
$ diskutil eject /dev/disk7
And there you have it, a bootable, Linux install USB drive.