Finnix is Genome / Linux Kernel 3 and only 102 MiB and fits a mini CD.
Below is a reproduction from Finnix Organization.
If I write about Linux Live CD that boots with windows X desktop only, I am doing an injustice to the Linux Developers, who make wonderful Little Utilities for system administrators.
Below is one of them, a CD that boots without a desktop window on a terminal (window) with 300 MiB of utilities.
Download and enjoy!
Thank you Guys and Girls of Finnix organization.
Finnix, the LiveCD for system administrators
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Finnix is a self-contained, bootable Linux CD distribution (“LiveCD”) for system administrators, based on Debian. You can mount and manipulate hard drives and partitions, monitor networks, rebuild boot records, install other operating systems, and much more. Finnix includes the latest technology for system administrators, with Linux kernel 2.6, LVM2, encrypted partitions, etc. And above all, Finnix is small; currently the entire distribution is over 300MiB, but is dynamically compressed into a small bootable image. Finnix is not intended for the average desktop user, and does not include any desktops, productivity tools, or sound support, in order to keep distribution size low.