Photos: Toshiba launches world's lightest laptop 
Published: 22 Jun 2007 10:27 BST
The R500 has a 12.5-hour battery life, so Hempleman-Adams will be carrying spare batteries for the journey. As his R500 will have to integrate with the Iridium satellite phone, Hempleman-Adams' machine will have to run Microsoft Vista rather than Windows XP. However, Toshiba claims that XP could give up to an hour-and-a-half of extra battery life compared to a machine running Vista with the Aero graphical interface.
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