USB
Speaking in terms of standards, USB 3.0 Promoter Group Chairman, Jeff
Ravencraft, detailed that SuperSpeed USB (USB 3.0) is on track
for initial deployment in 2009. The 1.0 specification is expected to be
passed in Q3/4 2008, and companies will ship discrete products in Q2
2009
Noting that backwards-compatible SuperSpeed USB 3.0 can potentially
transfer at 5Gbit/s - translating to downloading a 27GB HD movie in
just 70 seconds - we wonder which hard drives can possibility handle
that kind of traffic now. Ravencraft commented that SuperSpeed USB is
architected for a five-year lifespan, where, in the same timeframe,
flash-based drives will comfortably surpass magnetic drives' transfer
speeds. SuperSpeed USB, then, will primarily be
best-leveraged with flash drives
that can comfortably sustain transfers over 50MB/s.
Thinking about power, incumbent USB 2.0 continuously polls the host,
evaluating whether there's traffic, wasting energy, he noted.
SuperSpeed, however, is interrupt-driven, meaning that it only talks to
the host when ready to transfer, reducing the power profile. This
protocol won't change as SuperSpeed scales higher in speed.
Further, SuperSpeed uses two differential pairs to scale to 5Gbit's
transfer speed, and that's available on cables up to three metres long.
Initial SuperSpeed cables will feature both optical-fibre and copper
wires at launch, but we suspect that due to keeping costs down,
copper-based wires will be more widely used.
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When I worked for Acer, I did get quite a few broken USB ports. Mainly the plastic bit comes off, leaving 4 the metal pins.
a similar thing happened to me with my new motherboard y'day :(
but with a SATA slot.. so it's just 6 metal pins sticking out from the board now..
only 5 slots useable now.. :(Quote
USB 2.0 continuously polls the host, evaluating whether there's traffic, wasting energy, he noted. SuperSpeed, however, is interrupt-driven
Does it poll the PC or the device hanging off the USB controller? From 'host' I'd assume the PC.
In either case, that's just bad design for systems integration.Quote
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