I have a system with 4 hard drives. It is configured like this:
/dev/sda - windows system, default partitions
/dev/sdb - storage, ntfs
/dev/sdc - storage, ext4
/dev/sdd - ubuntu system
It is a non-UEFI installation for both OS. If I recover Windows boot manager, PC boots into Windows which is normal. If I use grub, Ubuntu boots normally, but I cannot boot into Windows. Windows entry is displayed in Grub menu, but if I select it, I get some blue screen that says:
A required device isn't connected or can't be accessed
Error Code: "0xc0000025"
I have tried installing Grub on
/dev/sdd with the same result.
If I try to recover Windows using Windows DVD, automatic recovery does not work, I have to enter the command prompt and run
fixboot and other commands to recover my Windows. It happens if Grub is either on
If I recover Windows, I cannot boot into Ubuntu by selecting Ubuntu installation disk as boot device from BIOS - I get grub rescue prompt.
How can I have Grub working with both OS?