What determines the order of hard drives?

What determines the order of hard drives? I've got three hard drives installed in my PC, though the drive order shown in Windows doesn't reflect the order in which the drives are installed:
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Guest [Entry]

"From this KB article:

The disk-assignment numbers may not necessarily match the
corresponding SATA or RAID channel numbers. There is no assurance of a
consistent relationship between PnP enumeration and the order of the
hard disks that are detected during setup. Devices are presented in
the order in which they are enumerated. Therefore, the disk-assignment
numbers may change between startups. For example, assume that you run
Windows Vista, Windows Server 2008, Windows Server 2008 R2, or Windows
7 Setup on a computer that has two unformatted SATA or RAID hard
disks. In this situation, Windows may present the second hard disk as
Disk 0 when you are prompted for the disk on which to install Windows
Vista, Windows Server 2008, Windows Server 2008 R2, or Windows 7."