What happens with USB 2 on Vaio??

[mystudio]

My Vaio PCG K115s keeps telling me that I am connecting a fast USB hardware to a slow USB port. That's strange, 'cause, I thought all USB ports are USB 2.0 on this Vaio, I thought. It happens when I am connecting more then one USB thing on the USB slots. So, when the logiteck mouse is connected, and I plug in the USB 2 cardreader, I get this pop up screen. When the mouse isnt connected, it doesnt appear.
Is the mouse decreeasing the spead on the USB ports? And, are the three USB slots just on one USB port? What is the workaround, in that case?

Anyone who has an idea, be welcome!

Thanks in advance.
Marco

[vaiodon]

No, if you use a true USB 2.0 hub you'll be able to get devices running at the right speeds. Slowest devices connected downstream of the hub while the USB2.0/480Mbps devices are connected directly to the Vaio.

Internal to the Vaio there's a controller and a hub. You can work out the internal USB topology if you dive into the settings/control panel/admin tools/device manager applet but from your description it sounds like your Vaio has a single host controller and a 3 port root hub.

The "transaction translator" I mentioned above is the key to keeping the controller & root hub working at USB2/480Mbps speed while supporting peripheral devices working at their native speeds.

The TT allows the hub to buffer the data flows from USB1.0 & 1.1 devices onto a full speed USB2.0 interface.

Some external USB hubs, like the Belkin T4, have these transaction translator devices on each of their downstream ports so between the hub & the Vaio USB would run at 480Mbps while the hub separately buffers slower speed devices. Other USB2 hubs appear to have only one transaction translator so if one keeps all USB-2/480Mbps devices upstream of a single TT hub then that interface speed will be maintained while, downstream of the hub, the slowest connected device dictates the interface speed downstream of the hub just like the situation you have without an external hub.

That's my interpretation of what I've read recently - I'm confident I've picked it up correctly. An email to Belkin might confirm the story on the other hand the agent handling the email response might not be that savvy!