"iLink is another example which comes to mind (Why Sony, why?! Unpowered firewire requires me to carry around an extra power plug and cable!!). SuperAudio CD (DVD Audio being the standard)."
The spec includes unpowered connections. I don't see why Sony should be faulted for being over a year ahead of the game in the PC world---and at the same time were considering their own products and strategies... i.e. you would be using iLink for digicams and DV recorders... which have batteries.
The PC world is slow to be interested in the powered bus for some reason. Printers, scanners, and other peripherals usually ship with multiple ways to connect (usb, serial, or FW) and will have a power supply cord, but it's perfect for media and easy networking: hard drives (loaded with OSes and everything else) are perfect for powered FireWire. (Maybe MS didn't like the idea of people copying their operating system onto hard drives and was partly behind slow adoption of FireWire. Who knows. Just another way to think of it. At least, Sony had some form of FireWire two years ago. And, yes, unpowered buses are in the spec; the spec also looks forward to the future too.)
Is Sony still shipping unpowered iLink, by the way? If so, ouch.
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