Why front usb can't use removable hard drive

"Fault case" I recently purchased a USB 10GB mobile hard drive, and returned home to connect it to the back of the computer USB interface, to normal use. However, if the computer is connected to the USB interface, the system will not be able to find the mobile hard drive. What is the problem with the front USB interface of the motherboard?

"Profiling" This behavior is not necessarily the problem with the motherboard. We know that the front USB interface and the motherboard need to connect through the cable lead, because of its length, the diameter of the different, it will cause USB interface power supply current is greatly affected. The general rear USB interface is directly welded to the motherboard, so the power supply current will not be affected. However, the front USB interface has been converted several times to make the equivalent internal resistance and contact resistance become larger. The internal resistance of the natural power supply is correspondingly increased, which will result in insufficient power supply of the front USB interface. If you connect some devices with a larger power consumption on such an interface, the device will not be recognized. There is a solution can try, the general mobile hard disk box with a PS/2 interface line, when the USB interface is insufficient, the PS/2 interface can provide some auxiliary current. It should be noted that the general power consumption of larger peripherals, such as USB interface scanners, printers, mobile hard drives, etc., preferably connected to the rear of the USB interface. and the front USB interface is used to plug USB flash memory, MP3 player and other power consumption of small peripherals.

Note : More wonderful tutorials Please pay attention to the triple computer tutorial section, triple Computer office group: 189034526 welcome you to join