How good are bus powered USB devices? That’sa 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. 如何好，是总线供电的USB设备？ that'sa很好的问题和答案取决于设备和应用。开始，让我总结的情况/产品，你可以找到问题。从这里我们可以决定什么＆时， “巴士的权力”是最好的。
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大部分的问题，情况与USB设备，这需要一个沉重的电力负荷。产品如USB光碟[硬]驱动器，外部USB CD或DVD刻录机等，与这些产品，你需要很多的权力，如果你不得到它，你有问题，如果权力运行通过 USB cable USB缆线 (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. （ USB总线）您的设备是不足够的好机会产品就会失败。问题，如驱动器故障，燃烧的CD coasters或重复的USB中断期间的运作。
With the与 larger USB hard drives较大的USB硬盘 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.走出来，这是你需要注意的，我会建议您不要购买“ USB硬盘驱动器” ，而驱动器本身运行从USB总线的权力。
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 USB port on their keyboard or USB port from a card reader. Simply because those USB ports are most convenient to reach. Well “ those USB connections ” are not ideal. The weak link comes from the buss powered keyboard or card reader. Instead, the optimal method of connecting is directly to the USB port which is connected to your motherboard. OR if you have a USB controller card running off a PCI slot - that is fine too.但可让您说，您所涵盖的基地和购买了USB硬盘驱动器与一个外部电源适配器-现在我们必须考虑连接到您的计算机？很多次我听说过，使用户通过其连接的U SB端口上，他们键盘或U SB港口从读卡简单，因为这些USB连接埠，是最方便的达成。以及“ USB连接 ”是不理想。薄弱环节，来自巴斯动力键盘或读卡机，而是最佳的方法是直接连接到USB连接埠，这是连接到您的主板。或如果您有一个USB控制器卡运行小康PCI插槽-这是也没关系。
Some other common problems would be:其他一些共同的问题将是：
- A laptop with low power to it’s ports.一台笔记本电脑的低功耗，以它的港口。
- A USB cable longer than two feet. USB缆线的时间比两只脚。
- Poor quality USB cable or USB cable certified for only USB 1.1 use.质量较差的USB电缆或USB线缆认证的只有USB 1.1的使用。
If you are experiencing problems and found this article, be sure to purchase an external power adapter. Most likely that $10 purchase will solve your problems and save your data. Check with your manufacturer for power requirements - you will need a minimum of 5.0 VDC and 1.0A for a properly working device.如果您所遇到的问题，并发现此文章，一定要购买一个外部电源适配器。最有可能10元购买，将解决您的问题和保存您的资料，请与您的制造商为电源要求-您将需要有一个最低的5 .0伏直流电和1.0a上一个适当的工作装置。
From the above we may conclude devices which are good to run off USB bus power. USB gadgets such as digital cameras, reading small files off flash memory via a card reader, keyboards and any other low data transfer USB device.从上述我们可以断定装置是好的，运行小康USB总线的权力。的USB小工具，如数码相机，读小档案小康快闪记忆体通过一个读卡器，键盘和任何其他低数据传输的USB设备。
Items which need an external power adapter would include, USB hard drives, external CD or DVD burners, video cameras, USB hubs [if using with any of the previous] and any other device with high data transfer rates. * Note: If you have large files on flash memory - use a card reader or USB hub with power adapter .项目需要一个外部电源适配器将包括， USB硬盘，外接式CD或DVD刻录机，摄录机， USB集线器[如果使用的任何前]和其他任何装置与高数据传输速率。 * 注：如果您有大型档案快闪记忆体-使用读卡器或U SB集线器与电源适配器。
