All USB 2.0-compliant systems, such as laptop, notebook, and
desktop computers, must by definition support all three data rates:
1.5 Mb/s, 12 Mb/s, and 480 Mb/s. The nature of peripherals,
however, creates a situation that is a little less clear. One class
of peripherals may be available with either the fast data-transfer
rate of 480 Mb/s or the slower data-transfer rate of 12 Mb/s.
Included are:
digital cameras
CD-ROM burners
DVD drives
motherboards
flash card readers
adapter cards
scanners
other products
The second class of peripherals operates at slower speeds because
these peripherals do not need fast data-transfer rates. (And if
they supported such performance, it would add considerably to their
cost to the consumer.) These include:
joysticks
keyboards
mice
other products
They operate at the two lower data-transfer rates of either 1.5
Mb/s or 12 Mb/s.
The link is:
http://www.usb.org/info/usb_nomenclature
What they are recommending are:
-If a computer is labeled USB 2.0, then it must support speeds up
to 480Mbps; but if a digital camera is labeled USB 2.0, then it is
ok to support only up to 12Mbps.
-USB 2.0 or 1.1 are not recommended to be used as nomenclature as
the numbers are just revision numbers. Instead to label a device
that support 480Mbps transfer rate, the "High-speed USB" logo
should be used.
Well I see the problem created by both poor decision on USB.org
(requesting USB 2.0 computer to support 480Mbps but not so for DSC)
and USB device makers' not following the recommendations (many used
USB 2.0 nomenclature that's not recommended by USB.org).
I guess D70 supports USB 12Mbps but not 480Mbps as nowhere was it
mentioned with "High-speed USB" (which D2H does).
Ehieh