I want to install a Linux distro on my USB stick (8GB, so size is not an issue) that I can use in an emergency troubleshooting situation. I don't have a long requirements list, I just need it to be able to read HFS, NTFS, and FAT32 and work well on both PCs and Macs. If it includes some good toubleshooting tools (HDD scanner, for example) I've looked at Ubuntu a bit, but it looks too productivity-oriented and not technical enough. Maybe Debian or FreeBSD?