AaronKnoppix

Hi,
I'm trying to remaster my Knoppix run on CF following the steps in Knoppix Remastering Howto - Knoppix Documentation Wiki. I can not update package by: "apt-get update". At the first time apt-get update fails with "Dynamic NMap ran out of room". I tried "apt-get update -o APT::Cache-limit=150000000" and I got a new error :
E: Unable to write mmap -nsync (28 no space left on device)
E: The package lists or status file could not be parsed or opened
Next time, I increased Cache-limit into 250000000 and I got another problem:
Segmentation faultsts... 41%

I did "rm -vf /var/lib/apt/list/*" and "apt-get clean" before I did "apt-get update".
I am working on Chroot environment.
I checked "du -h /var" and got the last line of result was "164M /var", "du -h /usr" and got the last line of result "du: '/usr': Input/output error", "du -h /root" and got the last line of result was "8.0K /root".
I am a Knoppix beginner. Please help me. Thanks ^_^