I have LaCie 160 GB, 250 GB and one other generic externa HD with 160 GB. They are more a desk top type of hard drive (as it is a little bulky to carry it around). I am interested in getting one of those ultra portable external hard drive (usually bus powered by USB or Firewire without AC adaptor). There are some very compact units from LaCie and other manufacturers. Are they as reliable as the regular external hard drive?