So I see two NTFS partitions here.
/dev/sda1 63 294728489 147364213+ 7 HPFS/NTFS/exFAT
/dev/sdb1 * 2048 586090495 293044224 7 HPFS/NTFS/exFAT
The first is on the same disk as openSUSE or hd0 and the second is on hd1 as I see it. Which one is the real Windows Partition? How did you load Windows 7, before or after you installed openSUSE? Normally, when Windows exists on a separate hard drive, you should be able to make it first in BIOS boot order and have it load on its own. If that does not work, then Windows is messed up in some way and will never work when run from the grub menu. There is a nice script that can locate bootable partitions for openSUSE and for Windows. You can download the file here:
You can read about findgrub here:
Looking for Grub and Windows bootloader in all partitions.
Here is generic info on disk partitioning you might find helpful:
Each hard drive can have up to four PRIMARY partitions, any of which could be marked active and bootable. No matter what you might hear, only one of the first four primary partitions can be booted from. That means you can boot from Primary partitions 1, 2, 3 or 4 and that is all. In order to boot openSUSE, you must load openSUSE and the grub boot loader into one of the first four partitions. Or, your second choice is to load the grub boot loader into the MBR (Master Boot Record) at the start of the disk. The MBR can be blank, like a new disk, it can contain a Windows partition booting code or generic booting code to boot the active partition 1, 2, 3, or 4. Or, as stated before, it can contain the grub boot loader. Why load grub into the MBR then? You do this so that you can “boot” openSUSE from a logical partition, numbered 5 or higher, which is not normally possible. In order to have more than four partitions, one of them (and only one can be assigned as extended) must be a extended partition. It is called an Extended Primary Partition, a container partition, it can be any one of the first four and it can contain one or more logical partitions within. Anytime you see partition numbers 5, 6 or higher for instance, they can only occur inside of the one and only Extended Primary partition you could have.
What does openSUSE want as far as partitions? It needs at minimum a SWAP partition and a “/” partition where all of your software is loaded. Further, it is recommended you create a separate /home partition, which makes it easier to upgrade or reload openSUSE without losing all of your settings. So, that is three more partitions you must add to what you have now. What must you do to load and boot openSUSE from an external hard drive? Number one, you must be able to select your external hard drive as the boot drive in your BIOS setup. Number two, you need to make sure that the external hard drive, perhaps /dev/sdb, is listed as the first hard drive in your grub device.map file and listed as drive hd0. I always suggest that you do not load grub into the MBR, but rather into the openSUSE “/” root primary partition which means a primary number of 1, 2, 3 or 4. If number one is used, then that will be out. You will mark the openSUSE partition as active for booting and finally you must load generic booting code into the MBR so that it will boot the openSUSE partition. I suggest a partition like this:
0. /dev/sda, Load MBR with generic booting code
1. /dev/sda1, Primary NTFS Partition for Windows
2. /dev/sda2, Primary SWAP (4 GB)
3. /dev/sda3, Primary EXT4 "/" openSUSE Partition Marked Active for booting (80-120 GB)
4. /dev/sda4, Primary EXT4 "/home" Your main home directory (Rest of the disk)
0. /dev/sdb, Load MBR with generic booting code
1. /dev/sdb1, Primary NTFS Partition for Windows
2. /dev/sdb2, Primary SWAP (4 GB)
3. /dev/sdb3, Primary EXT4 "/" openSUSE Partition Marked Active for booting (80-120 GB)
4. /dev/sdb4, Primary EXT4 "/home" Your main home directory (Rest of the disk)