Irwin wrote in message
oups.com...

Differently if one starts with 0 and one starts with
1, that I can understand. But the order is different,
and that I do not understand. Can you explain?

Basically the NT/2K/XP family keep track of disks using IDs
that it writes to the disk and its scan for drives present as
the OS boots. DOS doesnt and numbers them from the
initial bios scan for drives in the very early boot phase.

That can see the number allocated vary.