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Slow USB 2.0 transfer rates on Vista Home Premium SP1

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Old 06-03-2008
 

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Slow USB 2.0 transfer rates on Vista Home Premium SP1
Im having problems with slow usb speeds between my 2 external hard drives and my external dvdburner. Im running a 2ghz Core 2 Duo Dell Precision M90 laptop with 2gb ram, 512MB graphics and 6 usb slots. I get a maximum transfer rate of 10-12 MB/s and I have installed newest Intel chipset drivers and checked bios for any settings that might have an influence. I have also tried plugging the drives into different ports to check if that would help but still same speed. I checked my device manager and both harddrives and burner are connected to the USB 2.0 controller. I think the problem is that when I look at the properties of the USB 2.0 controller I see that the system has only allocated 20% of bandwidth to it. As USB 2.0 is in theory 480 mbit, 20% of this would be 96 mbit, which comes to approx. 12 MB/s which is the speed im getting. So my question is if anyone know of a way to allocate more bandwidth to the controller? The dvdburner is 16x but will not go above 10x as the harddrives cannot deliver the data fast enough. My internal drive is a S-ATA drive and when I copy from this to the external drives there are no problems with speed. So my conclusion must be that Vista allocates too little bandwidth to the controller as I only have 1 USB 1.1 device plugged in (my mouse) and this is on a slot for it self. Anyone else experienced this problem or perhaps have a solution to it as I think 10-12 MB/s is around half the speed I should expect from the drives. I also tried looking in registry to find the reg that tells the system to allocate 20% but have not been able to locate it yet and I am not sure that editing the registry will solve this issue.

So I welcome any suggestion and hope someone might have a fix for this
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