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Symwave and MCCI claim to have demonstrated over 270MB/sec data throughput at the Intel Developer Forum in September 2009.īottom line: Don’t expect actual SuperSpeed data rates approaching 400MB/sec anytime soon. NEC recently demonstrated its new USB 3.0 controller transferring 500MB in 4.4 seconds or “only” 113.6MB/sec. Actual throughput in practice is typically up to 35 – 40MB/sec for USB 2.0 and may exceed 400MB/sec for USB 3.0. Figure C 4: Actual data throughputĪctual data throughput is usually much less than the maximum advertised USB specification and is a function of many variables, including overhead. On my system, the top six USB Root Hubs operate at Low-Speed and Full-Speed and the bottom two each operate at High-Speed. Figure Bįinally, click the Advanced tab to see the USB speed ( Figure C). Note that this Root Hub has six ports available - one of them used by the USB Mass Storage Device.
In this example, I have attached a flash drive and it is displayed as a USB Mass Storage Device. If the device is attached to this hub it will appear in the Attached Devices section. Open the Properties window for a USB Root Hub.
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Open the Device Manager and expand the Universal Serial Bus controllers item. You will probably have to try more than one USB Root Hub before you find the device you are looking for. You can determine whether your USB 2.0 device is a High-Speed device in the Windows Device Manager ( Figure A), although it is not a straightforward exercise. Look for these logos when buying a USB device. The USB Implementers Forum (USB-IF) has developed logos for each of the four data rates. 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. This is accomplished by referencing, not replacing, the USB 2.0 specification. Will this confusing labeling exist for USB 3.0? The USB 3.0 specification supports the three legacy speeds in addition to SuperSpeed. A device labeled USB 2.0 can operate at Full-Speed instead of High-Speed. This is usually, but not always, the case. Table C shows maximum data rates for the four data rate types. Each new USB specification has been backward compatible. Table B shows USB data rate types supported by the four USB specifications. Each new major USB specification introduced a new data rate. There are four distinct data rates – not to be confused with the four USB specifications. Dual-simplex simultaneous bi-directional data flow for SuperSpeed instead of half-duplex unidirectional data flowģ: The Low-Speed, Full-Speed, High-Speed and SuperSpeed confusion.Asynchronous instead of polled traffic flow.
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Dual-bus architecture - Low-Speed, Full-Speed, and High-Speed bus plus SuperSpeed bus.SuperSpeed - New higher signaling rate of 5Gbps (625MB/sec).
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USB 3.0 is one of the most anticipated changes to the PC in years. As you can see in Table A, it has been a long time since the USB 2.0 specification was released. USB (universal serial bus) was developed as an alternative to serial and parallel data transfer protocols.
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This article is also available as a PDF download. The examples in this document all use Windows 7. If you find an error in the documentation or have additional information, please post it in the forum.
Note: I have taken great care to verify the accuracy of this information, but USB is complex. Now that USB has finally arrived, albeit barely, this is a good time to compare the previous USB specifications with USB 3.0. The Linux kernel supports USB 3.0 as of version 2.6.31.
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That means that USB 3.0 is not likely to go mainstream until then.Ĭurrent versions of Windows do not support USB 3.0, but support is expected for Windows Vista and Windows 7 at a later date via an update or service pack. AMD may not support USB 3.0 until 2011 either. There is some bad news, though: Intel has announced that it will not include USB 3.0 in its chipsets until 2011. Dane-Elec has announced a family of external SuperSpeed SSD drives and add-in card, but you will have to pay a hefty premium for the extra performance. ASUS has also announced an add-in PCIe x4 card with USB 3.0 support, though it is compatible only with its P55 series of motherboards after a BIOS upgrade. USB 3.0 is here! After long delays and much touted promotion of the new specification, USB 3.0 is now finally available or soon will be on some new ASUS and Gigabyte motherboards. Find out about its availability, specifications, benefits, and limitations. USB 3.0 has been highly anticipated - and now, it’s finally here. USB 3.0 has been highly anticipated - and now, it's finally here. 10 things you should know about USB 2.0 and 3.0