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Posts Tagged ‘usb bus power’

How Good Are Bus Powered USB Devices?

usb bus powerHow good are bus powered USB devices?  That’s a good question and the answer depends upon the device and the application.  To start, let me summarize situations / products you could find problematic.  From here we can determine what & when “bus power” is best. Most problem situations are with USB devices which require a heavy load of power.  Products such as USB disc [hard] drives, external USB CD or DVD burners etc.  With these products you need a lot of power, if you don’t get it, you have problems.  If the power running through the USB cable (the USB bus) to your device is not enough good chance the product will fail.  Problems such as drive failures, burning CD coasters or repetitive USB disconnects during operation. With the larger USB hard drives coming out this is where you need to pay attention.  I would recommend against purchasing a “USB hard drive” where the drive itself runs from USB bus power. But lets say you’ve covered your bases and purchased a USB hard drive with an external power adapter – now we must consider the connection to your computer?  Many times I’ve heard users making the connection via their Continue Reading

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