To begin, a bit ‘o background. Just bought a new laptop, a Samsung. It had Win8 pre-installed with no option for getting Win7 for free. So the plan was to backup the drive, just-in-case, install Win7 and 12.3 using GPT partitioning and UEFI. And it worked with no problems. Both OS’ boot and work well with GRUB2 being the OS selection method.
Now we come to the issue. Win7 needs to be re-installed. In the past with standard BIOS and MBR partitioning this would mean repairing the LILO or GRUB install in the MBR of the hard drive with a live CD after the Windows installation finishes hosing it. However now things are, possibly, different.
The most basic form of the question is as such. After Win7 is re-installed what needs to be done to bring GRUB2 back to the forefront for OS selection and will this have any other affect on the OpenSUSE installation?
For reference my partition table is below.
Disk /dev/sda: 976773168 sectors, 465.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 26EBF845-703A-4DFA-9A21-0C1073CDDAC9
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2029 sectors (1014.5 KiB)
Number Start (sector) End (sector) Size Code Name
1 2048 210943 102.0 MiB EF00 EFI system partition
2 210944 473087 128.0 MiB 0C01 Microsoft reserved part
3 473088 256473087 122.1 GiB 0700 Basic data partition
4 256473088 273250303 8.0 GiB 0700 primary
5 273250304 357140479 40.0 GiB 0700 primary
6 357140480 976773119 295.5 GiB 0700 primary