Comment # 16 on bug 1096066 from Josef Reidinger

(In reply to richard bragg from comment #15)
> Will there be any guidance on custom location?  So if I want to put into MBR
> of a disk I enter /dev/sd? and it will get it right.
> 
> I did have one situation where somehow an extra disk showed up so my disk
> normally showing and sdb was actually sdc.
> 
> But in essence if I want GRUB to go to MBR of my second (data) disk I'd
> select Custom and enter /dev/sdb?

well, in such case as yast2-bootloader do not modify entry, but understand udev
links, I suggest to put there udev link which is stable like
/dev/disk/by-id/<disk_id> ( replace disk_id with real udev name )