Select the USB drive and boot, choosing "Arch Linux" from the menu. With the USB inserted in the laptop, restart it while holding the 'option' button. This resizes the volume disk0s2 to be 225 GB and creates a 128M boot partition and a linux partition that fills the rest of the space. I was also able to do this using the command line as follows diskutil resizeVolume /dev/disk0s2 225G MS-DOS "BOOT" 128M MS-DOS "ARCH" 0b Then create a new partition that is FAT formatted. Select your SSD on the left, go to the partition tab, and resize your Mac partition. It can be re-enabled after you resize the partitions You'll need to disable FileVault disk encryption in order to do this. Since we want to dual-boot our computer, we'll need to resize the OS X partition on the SSD and create a partition for the linux install. sudo dd if=archlinux-2015.04.01-dual.iso of=/dev/rdisk3 bs=1m Partitioning the drive This is a destructive process, so make sure you save the important files on the drive, since they will be erased. This will copy the ISO you downloaded onto the flash drive. Make sure you type the correct disk number in the next command. Once the ISO is downloaded, you should burn it onto a spare USB flash drive using the following commands in the OS X Terminal: diskutil listįind the USB drive that you want to burn to. The first thing you need to do is grab a current copy of the installation media. I take no responsibility for you losing your precious cat pictures if this messes up. Make sure your system is backed up with Time Machine before attempting this. This is the tale of my adventures installing Arch Linux on a Retina MacBook pro and dual-booting with OS X.
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