My 11NB5800 had 3 days left on the warrenty when I had my issue with Windows 7 so I took it in to them. They sent it away and replaced the HDD, it is now as good as new. I have since installed Windows 7 without issue so I wonder if a batch of these had faulty HDD and this is only seen when repartitioning and formatting. It seems we’ve all had similar issues… My advice, just replace the drive and it should be fine. Hope this helps someone.

Cheers

Ian