Found a solution myself - here is the link in case anyone else needs it

www.deinmeister.de/e_over8mb.htm
  "SR" <sranauta@ab.bluecross.ca> wrote in message news:fMMDf.150570$AP5.42553@edtnps84...
  Just upgraded the bios to 8.0 but still can't see more than 8gb on a 40gb drive.

  Anyone able to do this? Toshiba support is no use.

  Thanks