I have a 300GB drive that was in a non-LBA system, so it has a 135GB
partition on it. I now have an LBA-capable system, so now I want to
use the rest of the drive. I've never expanded a Reiser partition, so
I don't know the answer to this: can I expand the current partition to
fill the disk without damaging data already present? Or should/must I
create a new 165 GB partition on the latter portion of the disk?

Thanks.