[POSTED TO rec.photo.digital - REPLY ON USENET PLEASE]

In <3EF044EF.7080601@yahoo.com.au> on Wed, 18 Jun 2003 20:54:39 +1000, Stephen
Smith <spunk_in_ur_i@yahoo.com.au> wrote:

>Eyron wrote:

>> Is there a reason to go to USB2 with todays Compac flash cards?
>> The fastest cards I think top out at 4mb/s???
>> Nowhere near the USB2,s nominal rate and about the same rate as USB1.1.
>> 
>> Whats the point?

>One reason to go for a USB2 device for people that already have USB2 is 
>that using any USB1.1 device on a USB hub will drag other devices on the 
>hub down to USB1.1 speeds.  ...

Not true.  USB 2.0, now called Hi-Speed USB, supports both USB 1.1 and USB 2.0
devices running at full speed on the same bus.  See "A Technical Introduction
to USB 2.0" at <http://www.usb.org/developers/whitepapers/usb_20t.pdf>:

   ... To communicate with USB 1.1 peripherals, a USB 2.0 hub contains a
   mechanism that supports the concept of matching the data rate with
   the capabilities of the downstream device. In other words, the hub
   manages the transition of the data rate from the high speed of the
   host controller to the lower speed of a USB 1.1 device. This feature
   of USB 2.0 hubs means that USB 1.1 devices can operate along with USB
   2.0 devices and not consume disproportionate amounts of USB 2.0
   bandwidth. ...

-- 
Best regards,
John Navas     <http://navasgrp.home.att.net/>
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