Just nailed my BIOS & Vista partition

[Hadders]

Tim wrote:
> On Sun, 2006-12-17 at 11:29 +0900, Hadders wrote:
>   
>> Okay, so Grub clearly upset Vista by "switching"/"hiding" things.
>>     
>
> The hide option modifies the partition tables on the drive - changing
> the partition *type* from one that the system might read, to a hidden
> type.  Perhaps your other OS didn't like the type?
>
> I'm not sure of the value of hiding a partition.  It shouldn't be
> necessary for booting from another drive.  You should just be able to
> select the drive to boot from.  If you find some things insist that they
> must be on drive 0 when they're on drive 1, there's the map option to
> pretend they're plugged in the other way around.
>
> map (hd0) (hd1)
> map (hd1) (hd0)
>
> (If I recall correctly...  Consult the grub info file to be sure.)
>
>
>   
wicked! that's fixed the Vista problem too.
A quick scan of the device with fdisk showed that it has a "hidden NTFS 
partition", changing it back to "7" HPFS/NTFS and voila, I'm back in 
business, now I understand what Grub did.
Thanks heaps!

Now, the question is what does the map command do? just a memory swap? 
or something actual?

Thanks