The bug is in /usr/lib/os-probes/mounted/20microsoft

When probing the Boot Configuration Data binary file it makes several
invalid assumptions:

1. All recovery file-systems are named (in UTF-16) "Windows Recovery 
Environment"
2. The last entry in the /Boot/BCD file is related to the partition being probed
3. Any BCD it can't 'understand' must be "Windows Vista"

In my case /dev/sda1 (the recovery partition) has a /boot/bcd containing
"Vaio Recovery Environment" and "Windows Memory Diagnostic", neither of
which will match:

 elif grep -qs "W.i.n.d.o.w.s. .R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" 
"$2/$boot/$bcd"; then
  long="Windows Recovery Environment (loader)"

resulting in the default being used:

 else
  long="Windows Vista (loader)"

For /dev/sda2 (the Windows Vista partition) has a /Boot/BCD containing
"Windows Vista" followed by "Windows Recovery Environment". In this case
because there is no specific test for "Windows Vista" a match is made
with:

 elif grep -qs "W.i.n.d.o.w.s. .R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" 
"$2/$boot/$bcd"; then
  long="Windows Recovery Environment (loader)"

and the default 'else' clause that would set "Windows Vista" is never
used.


** Also affects: os-prober (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: os-prober (Ubuntu)
       Status: New => Confirmed

** Changed in: grub2 (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: os-prober (Ubuntu)
   Importance: Undecided => Medium

** Changed in: os-prober (Ubuntu)
    Milestone: None => ubuntu-10.04-beta-2

** Summary changed:

- Grub2 fails to properly identify Windows and Compaq recovery partitions
+ Grub2 affected when os-prober incorrectly identify Windows and Recovery 
partitions

** Summary changed:

- Grub2 affected when os-prober incorrectly identify Windows and Recovery 
partitions
+ Grub2 affected when os-prober incorrectly identifies Windows and Recovery 
partitions

-- 
Grub2 affected when os-prober incorrectly identifies Windows and Recovery 
partitions
https://bugs.launchpad.net/bugs/476625
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