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date: Fri, 28 Dec 2007 18:36:33 +0100,
group: microsoft.public.windows.vista.hardware_assessment
back
Re: USB
I've currently got 10 USB devices plugged in, all working though not all
being used at once (Vista Home Premium). Similar 4 USB ports on the rear of
the PC plus two usually vacant ports on the front. There's also a built in
memory card reader which connects internally to one of the onboard USB hubs.
If all the USB devices were running at the same time there would be 12 USB
devices operating, but half of the devices are only turned on as needed
All the on-board USB ports have dual USB1.1/USB2 functionality. I installed
2 external ,non-powered, 4 port USB hubs to accommodate all of my USB
devices. One hub is USB 1.1 for the low bandwidth, low power devices like
mouse, UPS, RF receivers. The other hub is USB2 for high speed, low power
devices like scanners. Devices that are high-power or high-bandwidth or
both, like external USB harddrive or WLAN adapter, go directly into the
ports on the PC.
A USB 1.1 hub would be inadequate for you but a powered multi-port USB2 hub
should work. A condition is that none of the devices should consume too much
of the available bandwidth of the hub, which would only be equal to the
single port that you plugged the hub into. For instance a WLAN adapter could
consume a full 500mw power plus a large chunk of the available bandwidth of
the hub and each harddrive could consume the full data bandwidth of the hub
on its own. If there are too many USB powered devices on the hub (some
scanners, USB powered hard drives, webcam, wlan adapter etc. ) they could
conceivably pull down the available power to the point where none of them
are functional. Its a question of balance. Printer, mouse, keyboard and
maybe one externally powered harddrive could work together on the same hub.
Intermittently used devices (i.e.. digital cameras) could also probably be
plugged in without causing problems. An externally powered scanner might
also work but it would impede the data transfer performance of a harddrive
when the scanner was operating.
You didn't mention if you'd installed Vista compatible drivers for that add
in USB card. The card wouldn't be functional until after the drivers for it
loaded in Windows. Does the card and its USB ports show up in Device
Manager?
"Sven Molin" wrote in message
news:O$6QqwYSIHA.3532@TK2MSFTNGP04.phx.gbl...
>I thought I could try once more time.
> And the screen went blue. My Windows Vista Ultimate x64 couldn't find any
> solution.
> What can I do to fix so I can use more then 4 USB connections?
>
> "Sven Molin" skrev i meddelandet
> news:uE0ZzgXSIHA.4880@TK2MSFTNGP03.phx.gbl...
>> Can anyone please help me.
>>
>> I have four USB ports in the back of my computer.
>> They are all used up.
>>
>> 1: Extern USB HardDive
>> 2: Extern USB HardDrive
>> 3: Printer Canon ip4500
>> 4: USB conectedion for mouse and keyboard.
>>
>> And I bought a PCI Express card with 4+1 USB ports inserted in my
>> computer. Its connected to 12v power.
>> But none of the HardDrives or the printer works in this USB ports.
>> So that card was a waste of money.
>> The only thing that work is a small lamp connected on that cards USB
>> ports.
>>
>> And I have tryed use a USB Hub with 7 connections and a power adapter,
>> but none of the extern HardDrive work here either its the same for the
>> printer.
>>
>> Wat's wrong? Why can't I use my USB hubb? Or the PCI Express USB card?
>>
>>
>>
>
date: Wed, 30 Jan 2008 09:59:10 -0500
author: RalfG
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