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Get the best USB 3.0 Fact and Functionality

 

USB 3.0 is one of the most anticipated changes to the PC in years. Here is a summary of the major changes:

  • SuperSpeed — New higher signaling rate of 5Gbps (625MB/sec)
  • Dual-bus architecture — Low-Speed, Full-Speed, and High-Speed bus plus SuperSpeed bus
  • Asynchronous instead of polled traffic flow
  • Dual-simplex simultaneous bi-directional data flow for SuperSpeed instead of half-duplex unidirectional data flow
  • Support for streaming
  • Fast Sync –N-Go technology
  • Support for higher power
  • Better power management
USB 2.0 does not always mean High-Speed. This is usually, but not always, the case. A device labeled USB 2.0 can operate at Full-Speed instead of High-Speed.

Will this confusing labeling exist for USB 3.0? The USB 3.0 specification supports the three legacy speeds in addition to SuperSpeed. This is accomplished by referencing, not replacing, the USB 2.0 specification. Low-Speed, Full-Speed, and High-Speed devices are USB 2.0 compliant but not USB 3.0 compliant, so a USB High-Speed device should not be labeled as a USB 3.0 device. The USB Implementers Forum (USB-IF) has developed logos for each of the four data rates. Look for these logos when buying a USB device.

Open the Device Manager and expand the Universal Serial Bus controllers item. Open the Properties window for a USB Root Hub. Tip: Start at the bottom USB Root Hub.

Next, click the Power tab (Figure B). If the device is attached to this hub it will appear in the Attached Devices section. In this example, I have attached a flash drive and it is displayed as a USB Mass Storage Device. Note that this Root Hub has six ports available — one of them used by the USB Mass Storage Device.

Finally, click the Advanced tab to see the USB speed (Figure C). On my system, the top six USB Root Hubs operate at Low-Speed and Full-Speed and the bottom two each operate at

Actual data throughput

Actual data throughput is usually much less than the maximum advertised USB specification and is a function of many variables, including overhead. Actual throughput in practice is typically up to 35 - 40MB/sec for USB 2.0 and may exceed 400MB/sec for USB 3.0. NEC recently demonstrated its new USB 3.0 controller transferring 500MB in 4.4 seconds or “only” 113.6MB/sec. Symwave and MCCI claim to have demonstrated over 270MB/sec data throughput at the Intel Developer Forum in September 2009.

Bottom line: Don’t expect actual SuperSpeed data rates approaching 400MB/sec anytime soon.

I have a USB flash drive that can read at 26MB/sec and write at 6.6MB/sec and is typical of flash drives available as of late 2009. These data rates are within the actual High-Speed data rate. But Faster USB 3.0 flash drives are on the way that can take advantage of the SuperSpeed data rate.

Most hard disk drives can transfer data faster than 40MB/sec. USB 3.0 will be welcomed by those who like to back up data to an external hard drive or SSD drive or who have any USB device that transfers large amounts of data.

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