Hey. I have been using a USB-hub for my 3 external harddrives the last couple of months
I have vista home premium x64. I just found out I didn't need the hub cause I have enough usb-ports in my computer, so I disconnected the hub and placed all the three external harddrives in three different usb-ports. Now my system is running faster and the computer has stopped working all the time as it did before. You think the hub was making the system slower? 
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
My Computer
System One
-
- Manufacturer/Model
- DELL Studio XPS 435T
- CPU
- Intel Core i7 950 @ 3.07GHz
- Memory
- 6GB DDR3
- Graphics card(s)
- NVIDIA GeForce GTX 260 1792MB
- Sound Card
- Soundblaster™ XFi™ Titanium PCI
- Monitor(s) Displays
- 23 Inch Full HD
- Screen Resolution
- 1920x1080
- Hard Drives
- 1GB Internal 2GB MyBook External 1GB MyBook External 500GB MyBook External
- Case
- Studio XPS 435T
- Mouse
- Logitech G5
- Internet Speed
- 2MB