Slax Linux (Nick-named as pocket operating system)
What is Slax Linux and how to use it ?
Slax Linux is a small and light-weight operating system which is based on slackware. It can be booted from a Live-CD or a USB. Slax Linux has a small size of over 200MB. Unlike other linux operating systems which focus on hard disk installation, Slax works completely from a USB and needs no particular installation or dedicated partition. You don't have to create a new partition for installing Slax. You can boot it from a pendrive and the changes you made are stored in the pendrive for later use.