Contacted Toshiba. They suggested to reset the Portege to factory settings (press and hold 0 and power on).
When finished reinstalling try again to create the media.
Unfortunately after this procedure I got the same error. Toshiba will now send a set of recovery DVD's.
Didn’t you read the second message from lowlands?!
Toshiba will now send a set of recovery DVD's.
You can try to use another kind of disk from another manufacturer in order to create a recovery disk.
Sometimes not all disks are compatible…
Otherwise order new disk here: http://backupmedia.toshiba.eu/landing.aspx