Flash drives and external hard universal serial bus function as CDs and DVDs. They are also easy to use-but not all motherboards support USB device bootable. Modern computers can boot from hard drives, disk drives, network drives and USB drives, PCs but created before the development of USB drives do not support booting from USB. To see if your computer can be loaded from a bootable USB drive, check the settings in the entry / exit system to base to see what boot devices on the PC supports. Instructions
Comparing Hubs X and S to Hub L, it is clear that the design appears to be simplified. Hub L has far more components, and appears to have improved ESD robustness. Close to each connector there is a small bi-directional TVS diode for the USB data signals. These TVS diodes will shunt high voltages to ground or the 5V plane. It is debatably better to shunt the energy to the shield, but Hub L’s inclusion of the TVS diodes is a big step above the other designs.
The other hubs failed to properly treat the ground shield signals separately. Hub L takes an acceptable approach. Ground and shield are capacitively coupled small (100nF) ceramic capacitors near each connector. At one of the connectors, a high resistance (1MΩ) “drain” resistor ties the the ground and shield together. This allows the ground the shield to “float” during short events like ESD strikes, but eventually return to equipotential to prevent ground loop currents in the shield.
We have disguised the brand names of these four hub suppliers, referring to them with single letters: “X”, “T”, “L” and “S”. Each of these hubs were purchased from reputable online vendors and were advertised for use in industrial environments. All except Hub T claimed to have ESD protection up to ±15kV; Hub T did not specify an ESD rating. The prices for the hubs varied widely, too. The following table shows the range of prices found for the same brand and model of each hub.
For everyday use — like connecting a mouse or webcam to your laptop — an inexpensive USB hub with enough ports will get the job done. However, in production or test environments, robustness and reliability are paramount. Chasing bugs inherent in inexpensive USB hubs is distracting and time-consuming, and failed processes can shut down lines or negatively impact your product quality. Even worse, a cheap hub may be able to damage your critical production systems.
On many PC systems, a USB hub is connected. With some knowledge you set USB hubs, a more efficient and use the terminal potential to the full.
As a hub, a hub or star distribution is called the “computer language”. USB hubs (USB = Universal Serial Bus, dt. = Universal serial bus system) have evolved on PC systems to one of the most frequently encountered peripheral devices, because they are in daily PC use a practical aid when connecting USB devices. In particular, the frequent arrival and unplugging USB connections becomes unnecessary by connecting via Hub, also to wiring paths can be simplified. The following hardware tricks you use the performance of your USB hub from well: