I have two SSD's installed in a workstation. One is using Ubuntu 10.04 LTS, the other Windows 7. Both boot fine, but Grub's entry for Windows 7 doesn't work. I have to exit grub so the workstation will go to the next boot device as defined in BIOS (which is the second SSD).
The thing is, I tried 12.04 LTS on this system previously, & the Grub entry worked fine.
update-grub generates the same entry for Windows each time, which looks correct.
Grub complains "No Such Partition" then lists the UUID of the "System Reserved" partition.
I am thinking it is a bug in Grub2?