Hiren's Boot CD is a set of system-recovery and troubleshooting utilities. Typically the distribution would be burned to a CD-R, but with the lowered cost of USB pen drives it is often more convenient to make a bootable USB version of the utility. Using the free Unetbootin utility, which makes bootable USB pen drives, and a 512 MB pen drive or larger, you can quickly create a bootable USB version of the Hiren's system utilities.
