[Gllug] How does grub number discs in mixed systems?

[John Winters]

I'm struggling to predict what labels grub will use for a system which 
I'm looking at modifying.

Currently the box has one PATA drive (hda) and one SATA drive (sda). 
Grub seems to reference these respectively as hd0 and hd1.

I want to replace the PATA drive with another SATA drive, removing the 
PATA drive.

Can I then reliably say that the original SATA drive (still sda) will 
become hd0 and the new SATA drive (on the second SATA controller) will 
become hd1?

I would welcome a reference to some definitive documentation on how grub 
decides the order in which to number the drives.  I've read several 
on-line tutorials but they all make the same mistake as the grub 
documentation - they assume you already know these basic details.

TIA,
John
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