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[Making a bootable USB key from an .iso image on Mac OS X](http://borgstrom.ca/2010/10/14/os-x-bootable-usb.html) - Junkman
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<h1>[Making a bootable USB key from an .iso image on Mac OS X](http://borgstrom.ca/2010/10/14/os-x-bootable-usb.html)</h1>
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<span class="date">2016/2/18</span>
<span>posted in </span>
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<h2 id="toc_0">Preparing the ISO image</h2>
<p>Now that our USB key is ready, we need to get our .iso image into a format that we can copy to it. Open up a Terminal (it too is in /Application/Utilities, and I’ll assume you know how to use the terminal).</p>
<p>Now, convert the image from a ISO to a Read/Write Universal Disk Image Format (or UDRW). Here I’m using the Debian 6.0.7 Net Installation ISO, but you can use anything else that’s an ISO file.</p>
<pre><code class="language-sh">$ hdiutil convert -format UDRW -o debian-6.0.7-amd64-netinst.img debian-6.0.7-amd64-netinst.iso
Reading Master Boot Record (MBR : 0)…
Reading Debian 6.0.7 amd64 1 (Apple_ISO : 1)…
Reading (Windows_NTFS_Hidden : 2)…
.....................................................................................................................................................................................................................................................
Elapsed Time: 2.054s
Speed: 81.8Mbytes/sec
Savings: 0.0%
created: /Users/evan/Downloads/debian-6.0.7-amd64-netinst.img.dmg
</code></pre>
<p>Once completed this will create the .img file. The hdiutil function likes to append a .dmg suffix to the file so it will probably end up .img.dmg after conversion.</p>
<h2 id="toc_1">Copy the image to the USB key</h2>
<p>We’re finally here. The easy part, actually copying the image to the USB key.</p>
<p>First run diskutil list to get a listing of the disks in your machine so you can identify the USB key. It will look like this:</p>
<pre><code class="language-sh">$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 249.7 GB disk0s2
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: *1.0 GB disk1
</code></pre>
<p>Here mine’s /dev/disk1.</p>
<p>Update: We want to use the RAW disk device so that our copy will happen much faster because the RAW disk device provides unbuffered access to the device (See this Apple mailing list post for more info). This is accomplished by simply prepending ‘r’ to the device so that /dev/disk1 is going to become /dev/rdisk1</p>
<p>Update 2: Specifying a blocksize of 1m will also significantly speed things up.</p>
<p>Next we use the dd command to copy the image over.</p>
<pre><code class="language-sh">$ dd if=./xbmc-9.11-live-repack.img.dmg of=/dev/rdisk1 bs=1m
</code></pre>
<p>On the command line we specify the Input File using if= and the Output File using of= and dd will copy the data from input to output, block by block.</p>
<p>Once it’s completed you can exit Terminal and remove the USB key from your OS X machine, it should now be able to bootup your ISO on another machine.</p>
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