Damn Small Linux USB
Sometimes, you find yourself in a position where having a Linux-distro running would make life so much easier. For example, if you like me, intend to format SD-cards in use on the Beaglebone Black to the ext4 file format. As an alternative to download and install Ubuntu, which is huge and slow on old hardware, consider Damn Small Linux on a USB memory stick.
Requires a USB memory stick of any size above 128 MiB.
Step 1: Download livecd creator unetbootin for your OS from http://unetbootin.sourceforge.net
Step 2: Start program and select Damn Small Linux from the distro list.
Step 3: Select target USB Drive and press OK, wait for download and install to complete.
There you go. Stash it away for future use or reboot and test it immediately.