How to copy files from livecd to a partioned linux harddrive

[Markus]

You just mount the partition rw and copy it over:
sudo mount /mnt/something
cp file/from/somewhere /mnt/hd??/path/filename

If the partition is already mounted:
sudo mount /mnt/hd?? -o remount,rw

If it's not in fstab you can include device and filesystem:
sudo mount /dev/hd?? /mnt/hd?? -t ext3