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I would like to have a safe "Linux-like start/boot from DVD or USB stick" environment.

How to do such security thing for the latest OS X (10.9 Mavericks)?

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I'm not sure how to make a live environment from a DVD, but it is relatively easy to do it with an USB flash drive or an external HDD.

To install it to your HDD or flash drive do the following:

  • connect your drive
  • open the "Disk Utility" and click on the corresponding drive on the left hand side
  • click on the partition tab and select 1 partition from the drop-down menu
  • click on options and make sure you'll format it with the GUID Partition Table in order to make the drive bootable
    • BE VERY SURE ABOUT THIS, YOU'LL ERASE EVERYTHING ON THE HARDDRIVE
  • now mount your install image and proceed with the installation, be sure to select the proper harddrive

Also, note that you already have a recovery partition.

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  • You can choose your startup disk by pressing the Option/Alt key just after the startup chime. This way you can switch between operating systems. Oct 25 '14 at 8:08

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