RE: LANANA: To Pending Device Number Registrants

Dunlap, Randy
2001-05-17T00:10:42Z

hpa wrote:
>
> 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.

Bulk-only USB storage is required to have serial numbers.
E.g., Zip drives, probably USB hard drives and CDs.
Drives that use CBI (control/bulk/interrupt) transport (mostly
floppies) are not required to have serial numbers.
(Cost thing, of course.)

> How about for other device classes?

Mice? no way. Keyboards? nope.
Webcams? nope.
Printers? optional.
Audio? no.
Communication? not mentioned in the spec.
Hub? not mentioned in the spec.

~Randy