OK I saw the FAQ entry and I'm trying those steps but I'm running into this problem.

I hit 'q' to get to the shell prompt. RO worked, but when I do 'unmount /dev/hda4' it says:

bash: unmount: command not found

Am I doing this right?
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One of the last MK2's from SonicBlue... Blue/60gig S/N: 030103111