chainloading harddisk at HighPoint controller with Windows

[Xen]

I am wondering, if I may.

I am testing bootability of a Windows 10 installation.

The card the disk is attached to is a HighPoint RocketRaid 2310. I 
believe this is a "firmware RAID" card but drivers may not be directly 
available in Linux.

Regardless that seems pretty irrelevant but I'm not sure.

GRUB sees the disk as (hd1) while the device I am using for the Grub 
loader is (hd0). That means my menu is also on (hd1) and Linux boots 
just fine, no issue whatsoever, probably because the disk is simply seen 
as a regular sdX.

But after booting the boot-stick (hd0) is now /dev/sdb, and the harddisk 
(hd1) is now /dev/sdc.

I have no clue how to approach this yet but Windows will not boot off 
chainloading.

Update-grub will give it the wrong numbers (hd2, hd1) but after fixing 
it in the edit window in Grub while booting, I get instant REBOOTS when 
selecting to boot that Windows menu entry.

Basically according to grub, my disk is at (hd1) and the map command 
would map it to (hd0) for Windows to have.

Windows probably sees the disk as a JBOD RAID device (HPT DISK 0_0 SCSI 
Disk Device). So the question is how can I chainload this device without 
the (Windows bootloader) instantly rebooting my computer?

Regards,

Xen.