By default it's programmed to drive the motors and manage power.

ENGADGET

When adapted to all-wheel drive, all three companies have kept that rear-drive feel as the default--only when the rear wheels slip does power get sent forward to the front tires.

FORBES: Overview

The U410, meanwhile, is roughly the same size as the U845, but it comes standard with a 1GB NVIDIA GeForce 610 GPU. Also, the U410's hard drive spins at 7, 200RPM by default, though it's not coupled with an SSD for faster boot times.

ENGADGET: Toshiba Satellite U845 review: an inexpensive Ultrabook worth considering