Burning an ISO to a USB Stick on Mac OSX
My kids have dropped my 10+ year old Sony Vaio laptop one final time, so it’s time to find another old laptop (they’ll do it again) & put a fresh Operating System (OS) on it. For the past 5 years the old Vaio had been running CrunchBang OS (Statler build) with no problems at all. It’s fast & minimalist, totally perfect for little monkeys (& significant others). Another big plus is the kids have previously downloaded a few viruses, but as CrunchBang is a variant of the Linux OS the viruses have had no effect as they are targeting Windows OS. Linux has it’s security right, with superuser’s only allowed to install software that may do any real damage… You can still get viruses for Linux, but there aren’t as many for sure.
Anyway you probably knew all that already? Last time I installed CrunchBang I burned a CD, but I wanted to get down with the cool kids and use one of those new fangled USB sticks to install it. Plus wowzas, the latest Waldorf build has an ISO that is bigger than a CD now! CrunchBang have some documentation on how to burn to USB, but from another Linux box. So I thought I’d put down what you need to do if you’re on OSX. My google-fu failed me when I tried to look for “Burn a ISO image to USB stick on OSX”
Firstly it’s really important to find out which device your USB stick is.
Side story: I once worked for a company whose multi-million pound virtualization system was wiped clean by one of our “IT staff” deciding it was a good idea to format their USB stick from the actual virtualisation machine. It had devastating effect; they also discovered that some important services were not being backed up! Oh my, the :shit: really hit the fan that day!! So please be careful.
If they’d just followed these following steps that should not have happened.
Find the correct device first:
Make sure the USB stick is removed from your machine
Open a terminal
You then should see something similar to this:
1 2 3 4 5 6 7
This is the disk (& partitions) that I do not want to touch!!! You may have more than one?
- now put the USB stick in and run
1 2 3 4 5 6 7 8 9 10 11
Now you can see there is a new device. That’s the USB stick!!!
/dev/disk1 (You should also probably check that it’s big enough to take the ISO you want to burn.)
Create a DMG
- Before you can burn to USB you have to convert the ISO to a dmg file:
hdiutil convert -format UDRW -o crunchbang crunchbang-11-20130119-i686.iso
Where crunchbang-11-20130119-i686.iso is the current download from CrunchBang, this could of course be *any* ISO.
Burn to the USB stick
When that’s complete run
sudo dd if=crunchbang.dmg of=/dev/diskN bs=8192
where the /dev/diskN is the USB disk we discovered earlier. In my case /dev/disk1. I’ll repeat it once more, incase you are stupid and you made it this far ;)
=> !!!!please make sure you reference the correct USB disk!!!! <==
From now on I’ll reference it as diskN so you don’t copy and paste, and then access the wrong disk! :)
If you get the error message: dd: /dev/diskN: Resource busy
diskutil unmount diskNand rerun the last command.
- When complete you should see something like:
1 2 3
- Finally, to safely eject the usb stick run
diskutil eject /dev/diskN
Now you have a USB stick (that you may boot from if the ISO is meant to be booted)!
BTW. You may have to change your BIOS setting to boot from the USB stick?