Cài đặt thiết bị USB


USB (universal serial bus) connections are typically used to plug devices such as mice, keyboards, scanners, printers, webcams, digital cameras, mobile phones, and external hard disks into your computer. You'll recognize a USB connection by the symbol usually displayed on the connector.

Illustration of the USB connection symbol
Symbol of the USB connection

Many devices need to have a USB cable plugged into them before they can be plugged into a USB port on your computer. Other USB devices, such as older mice and keyboards, have a USB cable permanently attached to them. And some USB devices, such as USB flash drives, have an integrated USB connector that allows them to be plugged directly into a USB port on your computer without a cable.

USB devices are among the easiest devices to connect to your computer. The first time you connect a device that plugs into a USB port, Windows automatically identifies the device and installs a driver for that device. Drivers allow your computer to communicate with hardware devices. Without a driver, a USB device that you connect to your computer—for example, a mouse or a webcam—won't work properly.

Before installing a device

Check the instructions that came with the device to see if you need to install a driver before connecting the device. Although Windows usually does this automatically when you connect a new device, some devices require that you install drivers manually. In those cases, the device manufacturer includes a software disc and instructions on installing the driver before plugging in the device.

If your USB device came with software from the manufacturer, check to see if it's compatible with this version of Windows. If it's not compatible, or doesn't say which versions of Windows it's designed for, try plugging the device in first to see if Windows can find a compatible driver.

If the instructions that came with your device contradict the information in this topic, follow those instructions.

Plugging in and turning on a device

To install any USB device, just plug it in to your computer. Some USB devices have power switches you should turn on before connecting them. If your device uses a power cord, connect the device to a power source. Then, turn it on before connecting it.

Next, decide which USB port to connect your device to. If your computer has USB ports on the front, consider using one of those if you plan to frequently connect and disconnect the device. (You can use any port the next time you plug in the device.)

Illustration of a typical USB cable and port
A typical USB cable and port

Plug the device into the USB port. If Windows can find and install the device driver automatically, you'll be notified that the device is ready to use. Otherwise, you'll be prompted to insert a disc containing the driver.

Picture of a notification message saying that a device has been installed
Windows will notify you when it finishes successfully installing a device.

After installation is complete, check the information that came with your device to see if you need to install any additional software.

Occasionally, a USB device isn't recognized by Windows and doesn't come with a disc containing a driver. In that case, you can try to find a device driver online. Start by checking the website of the device manufacturer—you can often download drivers from the "Support" section of such sites. For more information, see Update a driver for hardware that isn't working properly.

To watch a video, see Picture of a Play buttonVideo: Connect devices to your computer.

Tips

  • Make sure the device is getting enough power. If a device doesn't work properly when connected to a USB hub, try connecting it directly to one of your computer's USB ports. Some ports on a USB hub, monitor, or other device that's plugged into your computer might not provide enough power to support your device.

    Smaller devices, such as USB flash drives and mice—and devices with their own power cords, such as printers—typically work properly when connected to an unpowered USB hub. Some devices that use more power, such as USB-powered scanners and web cameras, require a hub that has its own power cord to function properly.

  • Make sure the device is plugged in to the correct USB port. Devices that transfer large amounts of information, such as external hard disks, scanners, and video cameras, function best when connected to high-speed USB 2.0 ports. Some older computers might include only USB 1.x ports, or a mix of USB 1.x and 2.0 ports. If your device requires a high-speed port to function properly, check the information that came with your computer to make sure that the port you're using supports USB 2.0. If your computer includes only USB 1.x ports, you can add USB 2.0 ports by installing a USB 2.0 card inside your computer.

Disconnecting a device

Most USB devices can be removed and unplugged. When unplugging storage devices, such as USB flash drives, make sure that the computer has finished saving any information to the device before removing it. If the device has an activity light, wait for a few seconds after the light has finished flashing before unplugging it.

If you see the Safely Remove Hardware icon Picture of the Safely Remove Hardware icon in the notification area on the right side of the taskbar, you can use this as an indication that devices have finished all operations in progress and are ready to be removed. Click the icon and you'll see a list of devices. Click the device that you want to remove. Windows will display a notification telling you it's safe to remove the device.

Note

  • You can also safely remove devices from the Computer folder. Click the Start button Picture of the Start button, click Computer, right-click the device you want to remove, and then click Eject.