You may remember the “Handy Drvie 300” from Fujitsu with its 250GB, so here you are the Handy Drive 400, which believe me on this one as really 400GB of space.
Sold in Japan for 216ˆ, this little wonder feature a 4200rpm HDD, USB 2.0, a size of 82x141.5x22mm for a weight of 230g.
http://www.akihabaranews.com/en/news-16009-Fujitsu+release+a+new+Handy+Drive%2C+400GB.html