Messages in this thread | | | From | "Dunlap, Randy" <> | Subject | RE: LANANA: To Pending Device Number Registrants | Date | Wed, 16 May 2001 17:09:06 -0700 |
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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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