How to install rEFIt on an external USB drive

Basically this with pretty pictures.

1. Download rEFIt from here.

2. Open the disk image.

3. Wait, the disk image isn't needed just yet...

4. Plug your flash drive in...

5. Open Terminal

Type diskutil list and press enter

Should like something like this:

The USB disks are always at the bottom. You can see mine is listed as:

In most cases, the IDENTIFIER for your USB flash drive is something else. In my case, it is disk3

Make sure to note your correct IDENTIFIER, otherwise u gon erase the wrong disk.

6. Erase USB flash drive using Terminal

In Terminal, type diskutil eraseDisk JHFS+ "USB" GPT /dev/disk3 but replace disk3 with your IDENTIFIER. Press enter. POOF there goes your data.

It gon look like dis:

7. Copy the "efi" folder to the USB drive

Recall that our USB flash drive was renamed to USB in the erase process.

In Terminal, type cp -R /Volumes/rEFIt/efi /Volumes/USB and press enter

Then, cd /Volumes/USB/efi/refit/ and press enter

Then, sudo ./enable.sh and press enter

YOUR PASSWORD AIN'T GONNA SHOW but type it in and press enter anyway. Why? Because UNIX.

Should look like this:

Done.

Eject the USB flash drive like you normally would, then reboot your Mac while holding the option key, and you should see rEFIt as an option.