Bug#604155: Windows 7 not in grub menu

[Daniel Pocock <daniel@pocock.com.au>]

Lennart Sorensen wrote:
> On Sat, Nov 20, 2010 at 07:07:31PM +0100, Daniel Pocock wrote:
>   
> > Package: installation-reports
> >
> > squeeze / amd64 fresh install on a Thinkpad X61s
> >
> > Windows 7 is already on the machine
> >
> > The installer told me it found Vista and asked if I want to install grub  
> > to the MBR.  I agreed to install MBR.
> >
> > On rebooting, the grub menu appears and Debian is the only option.
> >
> > Checking the partition table with fdisk, I can see that Win 7 is still  
> > there.
> >     
>
> Try running 'update-grub'.
>
> I have seen a number of cases where on install it doesn't detect windows,
> but running update-grub works and detects windows.
>
> It seems that during install it has a bug in some cases.
>
>   

I had already run update-grub, but that hasn't made any difference

I can boot Windows by pressing `c' in the grub menu, and using the commands

root (hd0,1)
chainloader +1
boot

The machine is a fresh install:

- Windows 7 (64 bit) fresh install onto blank disk
- Debian (amd64) installed from squeeze beta1 DVD

Is there anything else I can check to find the root cause of the 
problem?  I don't mind doing more test installs on this machine, it is 
dedicated for that purpose.