A Live Linux Distro which is as small as possible (no X, no networking, bash)

I've been trying to find a Linux distribution to fit my needs but I need something that seems to be more minimal then "minimal" distributions (Eg: Microcore Linux) seem to provide. I don't need X, I don't need networking, I need something that can launch a bash script, which runs a modified version of [dc3dd](http://sourceforge.net/projects/dc3dd/) , which talks to a serial device and outputs information to a user via the normal console and nothing else. It'll be booted from read only media (Probably a disc but could also be write protected SD card) and will run on x86 platforms. It'll need to access SATA/IDE hard drives. I don't have any memory limitations but anything that isn't being used needs to be gone. Can anyone point me in the right direction or perhaps to a tool which can build something I am looking for? I'm hoping to spend as little time as possible on altering an existing distribution so I can focus on the application itself.