Only Windows uses boot flags. Grub does not use a boot flag.
But a few BIOS (mostly Intel motherboards) check for a boot flag on a primary partition...
After your Windows install, are you sure you were working with unallocated space? Windows does not see Linux partitions and often in rewriting MBR &...
Drives have not actually used CHS values for about 15 years when hard drives went over 8GB. But some laptops will not boot a second drive in a caddy...
@Oldpeter
You should not have to. But if grub was not correctly installed to MBR in the first place it may have remembered to reinstall in that same...
Sorry you could not get it to work. There just are so many new options withe UEFI and each vendor seems to have done some things differently. It may...
Just do not know enought about RAID to help.
It does not show much of drives, but sdb does not have any partitions? The others at least show the one...