Re: LANANA: To Pending Device Number Registrants

Linus Torvalds
2001-05-16T23:53:02Z

On Thu, 17 May 2001, Alan Cox wrote:
>
> > Are FireWire (and USB) disks always detected in the same order? Or does it
> > behave like ADB, where you never know which mouse/keyboard is which
> > mouse/keyboard?
>
> USB disks are required (haha etc) to have serial numbers. Firewire similarly
> has unique disk identifiers.

Well, as that doesn't actually work out in practice, the good news is that
USB at least _tries_ to always walk the tree the same way when detecting
devices, so if you don't change where your devices are in the topologu
they should show up in similar places.

Of course, "not changing topology" also means things like not powering off
devices with external power supplies etc..

The serial numbers are probably not that reliable.

Linus