Re: Dimension 8400/Cruzer Micro Thumb Drive

William R. Walsh wrote on Date: Mon, 11 Aug 2008 08:41:54 -0700 (PDT):
Hi!

No! No! No! For starters, I seriously doubt there are any mice or
keyboards that are communicating at USB2 speeds.

There are at least a few keyboards that provide a USB 2.0 hub. Apple
Computer sells one right now by itself or with a computer.

Hi William! They may use an USB2 hub, but I bet the keyboard is still using USB1.0.

It's true that these devices could never saturate even the slowest USB
connection, but it's also true that at some point the faster parts
will be used because they are all that is available or they are just
as cheap as the slower parts or because it provides a feature the end
user would like to have (in this case, more USB 2.0 ports).

I would like to believe that, but I still find no evidence of this yet.

I believe the error you are seeing is mistaken. As I believe is really
means you are using a slow device on a fast USB2 port.

No, that is not what it means--it means that a USB 2.0 capable device
has been connected to a port that only operates at the lower speeds.

Then why do I see that message on my two Gateway MX6124 and two Asus EEE PC laptops which only sport USB2 ports?

Try it sometime--take a device that you *know* to support USB 2.0 and
plug it into a port that only provides a USB 1.0/1.1 connection.
Windows XP will tell you that the device could communicate much more
quickly if it were plugged into a USB 2.0 capable port--even if you
are using a computer that doesn't actually have USB 2.0 ports.

Yes I know and I have seen this too. But that doesn't explain why sometimes when an USB1.x device is plugged into USB2 ports you also can see this message.

You can click on the notification icon to see a list of USB 2.0
controllers and ports in the computer, if there are any.

I never seen that pop up. Does it happen on Windows XP SP2 machines too?

As all USB2 hubs has a bottleneck of 400mbps total for one.

That's about the maximum speed of USB 2.0 connections anyway.

Secondly, those cheap USB2 hubs has another bottleneck that
all USB1.0 and USB1.1 devices can only have 12mbps total!

That is not a limitation of the hub. That is a limitation of the
device and what kind of connection speeds it supports. You can't
expect that a USB 1.0/1.1 device is somehow going to connect at USB
2.0 speeds--it doesn't work that way whether you plug the device into
a hub or directly into one of the computer's USB ports.

You didn't read that article I listed, did you? If you are using an USB2 hub, all communications are converted to USB2 speeds going to the USB port on the computer if it is an USB2 port.

How USB Hubs Work
http://www.embedded.com/columns/technicalinsights/193501794?_requestid=70488


I am not sure why the OP is getting the message they are getting,
especially with no problems in Device Manager. The Dimension 8300 and
8400 both support USB 2.0 on any available USB port.

William

So does Gateway MX6124 and Asus EEE PC too. Although I believe the EEE PC BIOS sets all USB ports to 1.x speeds and Windows or Linux once it boots up flips them back to USB2 speeds once again. That is assuming you plug in an USB2 device. As ports will adjust to whatever the highest speed the device or the port can handle.

--
Bill
Gateway Celeron M 370 (1.5GHZ)
MX6124 (laptop) w/2GB
Windows XP Home SP2 (120GB HD)
Intel(r) 910GML (64MB shared)
** Posted from http://www.teranews.com **
.

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