For now I gave up on file transfer to the 1TB via USB relying on ipod's battery. I don't think that alone will get the 1TB completely filled without corrupting the drive at some point. The dual firewire/USB cable may have a good chance getting the job done, since it won't rely on ipod's battery for power.
With @dr408517's tips, I am now transferring the files to this drive via motherboard. It works great this way so far for the 5g, and much faster transfer speed too. By the way, this drive is switchable between the 5g/30GB and 5g/60GB models. I already tested this.
I will load this babe full via motherboard and see if there is any issue.
EDIT: Did this
MyDigitalSSD 480GB mSATA just come out recently? No review yet at Amazon.