Windows 7 does not detect multiple external hard drives

I recently bought a HP Pavilion laptop to 7 Home Premium. I have two 500 GB external hard drives. When I connect them individually to the system, they are recognized and I can copy files to and from these External Drives. But when I try to connect both at the same time, Windows 7 does not detect the drive I connect then. Any help is greatly appreciated.

If the disks are powered by the USB bus and do not have their own external power supply the problem is that the laptop does not provide sufficient USB power to control both.

The USB specification, is that each port should provide 500mA at 5V. To keep their batteries, laptops usually provide 500mA to share between all available ports. If you need to use several USB devices with significant power, you must either externally powered USB hub or to provide the devices with their own power supply to cutting.

Tags: Windows

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