I pretty much followed this. http://wiki.tinycorelinux.net/wiki:remastering Skip down to this part.
core.gz is 8.1.5v7.gz file from mmcblk0p1.
Code: [Select]
mkdir /tmp/extract
cd /tmp/extract
zcat /tmp/core.gz | sudo cpio -i -H newc -dcore.gz is 8.1.5v7.gz file from mmcblk0p1.