Hi,
6.4 gig will work, just can't do much storage as the block size of the myth partition only leave a few inodes. You run out of them before you are actually out of space. There are some tricks that can be done to help
Just reformat it as a standard partiotion and it will be good for music, pictures, motion images. Just be sure to copy all the files into the root (hda1) /myth partition first.
How you ask? edit the /etc/fstab and put a # in front of the /dev/hda3. reboot and when it comes back up, only root will be mounted. ls -al /myth should should show the need files. If not, redit fstab, remove the # and change the mount point from /myth to /media/hda3. mount /media/hda3 and then cp -a /media/hda3/* /myth/ (I am assuming E50) Once you have the copy, you can reformat hda3 to obtain smaller blocks and more inodes.. stay away from tv other than a quick test.
If you did a standard auto install, then I would suspect maybe a defective network cable. In light that all the ip numbers are good, that would make me suspicious of either the card or the cable.
You could also try a ping on it's self ie ping localhost and ping your local machine ip (/sbin/ifconfig will give you that info) That will tell you if the interface is good up to the actual output driver circuit.
Mike