RE: LANANA: To Pending Device Number Registrants

[Dunlap, Randy]

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

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