Universal Serial Bus, USB technology allows you to easily connect peripherals (such as digital cameras, scanners or mice). USB is designed to work with various devices and support hot swap. So, you can connect your camera to the PC, download the photographed photo, and do not need to configure software or restart your computer.
The USB standard provides an unparalleled advantage of early connection technology, so rapidly got the market's recognition and welcome. However, we now use the most USB version of the 1.1 version, and its maximum data transfer speed is 12Mbps per second. This transmission speed is enough for keyboard, mouse, and CD-ROM drives, but when using digital cameras or high-speed external hard drives, this speed is a bit stretched.
It is hoped that it is faster than the USB connection. The most common technique for transmitting digital videos to home PC is the IEEE (Institute of Electrical and Electronics Engineers 1394). The technology is also known as "firewire), which exceeds USB 1.1 in a transfer speed of 400 Mbps, which is why most digital cameras are equipped with the IEEE 1394 (FireWire), not the USB port.
But now USB has introduced new version -USB 2.0, which has data transfer speed up to 480 Mbps, which exceeds IEEE 1394, and has won it "High Speed USB" nickname. The USB device is now always run at 12 Mbps (for full speed) or 1.5Mbps (for low bandwidth device). USB 2.0 allows you to use more devices with new speeds, which can provide all 480Mbps bandwidths for high-speed devices using USB2.0. Such high speeds are important for those desirable bandwidth applications such as mass storage devices, although not all devices can operate at a speed of 480 Mbps. For example, the USB 2.0 mouse still belongs to a low speed device, which may only run at a speed of 1 Mbps, but high-speed USB 2.0 CD-RW devices can use new USB 2.0 high-speed transfer to burn CD.
Compatibility with USB1.1
Other creators of Microsoft and USB 2.0 standards do not discard the USB 1.1 standard. USB 2.0 is fully compatible with USB 1.1 devices. Older equipment can work on the new bus, and vice versa. However, remember: You cannot connect a high-speed USB device to the USB 1.1 controller, then expect it to run at a speed higher than the USB1.1 standard. Your computer can only run at the speed of the slower device in the device chain. In other words, all USB2.0 hubs on the market cannot provide you with the old laptop of the USB1.1 controller. You either buy a USB 2.0 controller in the form of a PC card, or buy a new notebook with a USB 2.0 controller. These devices can also work well when you insert high-speed USB 2.0 devices on the older USB 1.1 controller - but their speed can only reach 12 Mbps instead of 480 Mbps.
The backward compatibility of the high-speed USB standard means: I can start looking for a new USB 2.9 device now, even if my computer does not have USB 2.0 capabilities. If you often pay attention to your local computer store, you may notice that some USB 2.0 devices have appeared on the market. Many manufacturers have produced a USB 2.0 PCI controller card for desktop PC. The price of USB 2.0 PC card for laptops is below $ 80. Moreover, high-quality USB 2.0 cables have taken a few months. USB 2.0 does not require you to buy a new USB cable unless your cable quality is worse, you can't work well under USB1.1. You can purchase a certified USB 2.0 cable, but their quality is generally different from high quality USB 1.1 cable. I can't tell you, when I use USB 1.1 speed to download a few MB data to my MP3 player, if I use the USB 2.0 connection, how fast the download speed should be. I have been waiting for the MP3 player that is compatible with the USB 2.0 standard, because although my USB 1.1 player can work well on the new USB 2.0 hub, its speed is not improved.
USB 2.0 device driver support
Some equipment manufacturers have begun to sell new desktop PCs and laptops that support USB 2.0. If you want to add USB 2.0 support for your computer, you have to purchase and install a USB 2.0 controller card. For desktop computers, you must open the chassis and plug the card in the computer's PCI slot. For laptops, you can plug in USB 2.0 PC card when you want to connect to a new high-speed USB device. Most equipment manufacturers provide product installation and setup guidelines. Here is an example from Adaptec. The Windows directory lists several USB 2.0 controller cards compatible with Windows XP.
The USB 2.0 device driver under the Windows XP operating system is provided to the user from Windows Updates in January. Windows XP Home Edition and Windows XP Professional and USB 2.0 are fully compatible with USB 2.0 with the correct driver installed. Before you purchase a new USB 2.0 device, visit Windows Catalog to make sure the device is kept compatible with Windows XP.
After you have installed new USB 2.0 controllers and devices, connect to the Internet and open Windows Update. Confirm that after inserting new hardware, the device can work normally (at least a low speed). If Windows XP can identify your USB 2.0 hardware, it will prompt you to download the new USB 2.0 driver. In addition, you can manually download the driver in accordance with the steps in Windows XP USB 2.0 support. USB 2.0 driver on Windows Update
USB 2.0 device driver is difficult to answer
If your computer is installed on your computer, the Microsoft USB 2.0 driver may not be listed as an available update. You must first delete a third party USB 2.0 driver before installing the Microsoft USB 2.0 driver downloaded from the Windows Updates site. Windows Updates is currently available to the USB 2.0 driver for Windows XP only recognizes the device using the NEC USB 2.0 EHCI controller chipset. Enhance Host Controller Interface (EHCI) is a industry specification for high-speed USB devices. This doesn't mean you have to buy a controller hanging NEC brands. The NEC chipset is in the USB 2.0 world. It is the first chipset that is recognized by a separate USB 2.0 test mechanism. Although the USB 2.0 driver on Windows Updates currently only supports the NEC controller, it will quickly be upgraded so as soon as it provides support for all compatible EHCI's controllers. If you are confident that everything on your computer is compatible with USB 2.0, you can only connect with your device at low speed, then you may not have the correct driver. If you are in Windows XP, you may see a similar "General USB HUB is a high-speed USB device, when you put it in a low-speed port, it will work at low speed." Error message, or "A high speed USB device is inserted in a low speed USB hub. In addition, you can also see in "Device Manager", with a yellow exclamation mark mark next to your high speed controller. This problem is mainly because: Although you have a high-speed USB hub or controller, Windows XP does not recognize it. (See Knowledge Base Article, Windows XP supports more details for the General Serial Bus (USB) 2.0.
Below I gave a set of USB2.0 driver downloads:
USB2.0 driver
Hardware name
file name
operating system
File size
Update Date USB 2.0 for Intelusb2_intel.zipwindows 2000 / XP
1.29MB
USB 2.0 for Win98USB2_WIN9XME.ZIPWINDOWS 98 / ME
208KB
Final version USB 2.0 for viausb2_via.zipwindows 98 / ME
2.99MB
For windows 2000: ==================
1. Right-click on the "My Computer" icon on the desktop, select the Properties menu from the pop-up menu.
2. Select "Hardware" -> "Device Manager" from the System Properties dialog.
3. Right-click the General Serial Bus (USB) Controller ", select the Properties menu from the pop-up menu.
4. Select "Driver" -> "Update Driver", click Next.
4. Select: "Search for drivers for my device" -> "Next".
5. Select "Specify a location" -> "Next", click "Browse" button, position to the path (Your CDROM) /DEVDRV/USB2.0/USB2_2K
6. follow the steps until it is complete.
