happens is that the BIOS does not see the bootable USB flash drive.This can happen on any personal computer with absolutely any operating system, be it Windows XP, "seven" or "eight".What to do if the BIOS does not see the USB flash drive?This is a very popular question among all users.Moreover, such a problem at least once in his life faced anyone with a PC or laptop.Some people in this situation, immediately contact the service centers.Some even go to the store where you bought the stick, with disturbances and complaints that it is not working.
course, maybe this is really all a matter of faulty devices.But sometimes BOIS does not see the USB flash drive for other reasons.And even if the earlier all was normal, the problems that have arisen now that can be caused by different defects that are just "piling up" in the system.Or the flash card may not have enough power to your system unit.Or ... Below you will find the most popular reasons for which there are troubles with the definition of flash drives, and other USB-devices, as well as how to solve these problems.
why the BIOS does not recognize the removable media?
When you connect an external storage device or via USB-port, is its automatic detection, and "Device Manager" reports that the new media is connected.In some cases, it also requests the drivers to install or upgrade.But sometimes the BIOS does not see the bootable USB flash drive or can not synchronize its work.What to do in such a case?There are several the most likely causes of and solutions to this trouble.
USB-controller: setting
BIOS is a part of the operating system on which the problem lie with the stick in most cases.Where exactly lies the problem?The most obvious reason why the flash drive is not detected BIOS - USB-the controller is not working properly, or simply turned off.How to cope with the problem?Turn it!For this in the Award BIOS get Subpart Integrated Peripherals, and then go to the second menu item - Advinced (which will be extended settings BIOS).Then find a category USB Configuration, go to it, press Enter, and pay attention to the label, which will appear in front of parameters USB.There may ignite Disabled (disabled) and Enabled (connected).If the controller is switched off, you need to turn it on using the pointer.To save the new settings be sure to press F10.
If the controller is connected, but the BIOS does not see the USB flash drive, you can try it in another port of the system unit.Perhaps this is faulty or improperly configured, and that prevents it from functioning.
Sometimes none of the ports can not detect the USB flash drive.In this case, it makes sense to update the driver of the USB-controller.Very often this problem occurs after reinstalling the operating system, or rollback, it can be lost when a part of the necessary data or parameters are reset to the "default".Therefore, to reload all the latest drivers can solve the problem with the stick.
Compatibility issues
vast majority of modern peripherals only supports USB version 2.0., Which, of course, will not be recognized on the computer, the interface that is configured for 1.1.In this case, to solve the problem you just need to install supporting software, which, as a rule, always comes with the device - on a single disk with drivers or separately.Sometimes the desired application can be downloaded from the official websites of manufacturers of USB-drives.
system file INFCACHE.1 - the root of all evils
If you have tried all the above listed methods, but the problem has not disappeared, you can try another one, but the cardinal method.Simply remove from the computer system file INFCACHE.1.You can find it in the root directory of WINDOWS, hard drive C or on where you installed your operating system.The full path to the file is as follows: WINDOWS: system32DriveStore.You can also find it by searching or by using the command line.If you delete this file after the problem has disappeared, it means that all the problems have been linked to damage to the cache.The next time you turn on your computer file INFCACHE.1 recover by itself.
And yet the case in BIOS?
instruction on this part of the software system to help cope with the problems of a stick in some cases.For example, if, as mentioned above, the problem in the off-USB controller.Proper configuration of BIOS - business simple, but important.To cope with this can virtually anyone, even with little experience of the personal computer.
So, in order to get to the settings, you need to press F2 (in some cases, DELETE) when the load of the BIOS.Then you need to go to the tab Advanced, where you can manage advanced features, select the section Integrated Peripherals and press Enter.Following these simple manipulations, you can see whether the controller, as well as other agents that affect the functioning of ports and automatic detection of USB-connected devices.
BIOS does not see the other connected through the port device
If the computer is unable to determine not only stick, but other external media and Soup connected via USB (such as a printer, speakers, camera, or phone), thiscase requires specific and radical measures.
REMOVE COVER (protective side plates) from the computer.Typically, they are either screwed to the housing bolts, or are fastened to the "gate," and then we connect a USB flash drive or other device directly to USB-port on the motherboard.In most cases, this may be enough that the BIOS saw the device.But if it does not, you can try to install the appropriate drivers for correct operation and avoid problems of incompatibility.If this does not work - the output is still there!
Other reasons why the BIOS does not see the USB flash drive and other USB-devices
Often it happens that the computer is connected to many different devices that require large amounts of energy.For example, a scanner or a powerful sound system.And the two connected devices can be enough to cause a shortage of power when connected even such cost carrier as a flash card.What to say about trying to connect to the computer and the camera has to be reset or view photos on the big screen.In this case, the BIOS does not see the stick (or other device) due to too low level of electricity that can be expended for this port.In other words, the device may require more power than can provide a USB-connector.As a result, it simply does not have enough power to turn on and functioning.
In order to avoid this problem, you need to know the power consumption of USB-controller is your personal computer.Refine this can be in the "Device Manager" tab of the "Properties" in the "Power".-USB 2.0 devices need, as a rule, 500 mA, and the newer version 3.0 had consumed 900 mA.From this, it can be assumed that sometimes connect to some devaysa must first disable one or more previously connected, but currently unused devices.If you charge your phone or player from the computer and the flash drive is not detected in parallel with this, you should try to disconnect the power cord to the charging time.In 90% of cases it will be enough that the BIOS saw the connected device.
Or maybe blame the flash drive?
you have tried everything, but nothing helps?Then there is the likelihood that the case in the device.You can read about your flash drive reviews.BIOS can not be the reason that it is not determined if you came across a device with factory marriage, for example.It is also possible that this model requires any special manipulation or the presence of USB-HUB'a to work properly.Options can be a lot, so you should examine all of the existing methods for determining the issue.
Conclusion
If the definition of the problem, because of which the BIOS does not see the USB flash drive, and its decision was not successful, then, of course, is to contact the service center.But before that, simply turn off the power management USB-controller from the operating system.To do this, go to "Device Manager" tab, find the "Universal Serial Bus controllers", choose the subsection "USB-Root Hub" and double click calls the window "Power Management", remove the check box and click «OK» to save the changes.And repeat this process for each USB-hub.Perhaps this will save you from going to the service center.
