USB 3.0: The new speed limit
We check out the first devices equipped with USB 3.0's SuperSpeed spec
Computerworld - Have you spent too much time waiting for large files to crawl between a computer and an external hard drive? Don't fret -- USB 3.0 has arrived. Not only can it move data faster and provide more power, but it's compatible with USB 2.0 devices.
The key to blending old and new is NEC's μPD720200 controller chip. It has the circuitry for USB 2.0 and 3.0 transfers inside and can use either, depending on what's plugged in. Right now, it's the only game in town, but look for other companies, including Symwave, Fujitsu and Via, to introduce their own USB 3.0 chips in the coming months.
The first round of USB 3.0 cards and devices works with Windows Vista and Windows 7; Apple hasn't decided whether to support the new standard. The basic software for USB 3.0 has been in the Linux kernel since last fall, and the needed drivers are slowly coming out.
There are already a few USB 3.0 devices available. To test them, I used a Lenovo ThinkPad W510 with USB 3.0 built in. I tried out a variety of new devices, including the Buffalo DriveStation USB 3.0 HD-HXU3 external hard drive; a StarTech SuperSpeed USB 3.0 to SATA Hard Drive Docking Station in combination with my current Western Digital WD Caviar Blue external drive; and a Seagate BlackArmor PS 110 USB 3.0 Performance Kit, a portable hard drive that includes its software on a USB 3.0 ExpressCard.
What's new in USB 3.0?
Unlike the change from USB 1.0 to USB 2.0, USB 3.0 brings actual physical differences to the connectors. The flat USB Type A plug (that goes into the computer) looks the same, but inside is an extra set of connectors; the edge of the plug is colored blue to indicate that it's USB 3.0.
On the other end of the cable, the Type B plug (that goes into the USB device) actually looks different -- it has an extra set of connectors, so it looks a bit like a USB plug that's been crimped a little ways down one end. There's also a new Micro Type B plug that has all its connectors laid out horizontally.
As a result, you won't be able to fit a USB 3.0 cable into a USB 2.0 device. However, you will be able to plug USB 3.0 devices -- and cables -- into your current computer; you just won't get the speed advantage. (Note: To get the most out of USB 3.0, the cable needs to be less than about 9 feet long, down from the USB 2.0 16-foot limit.)
The reason for the new connector is that the USB 3.0 cable contains nine wires (four more than a USB 2.0 cable); eight carry data and one is used as a ground. Despite the increase in wires, however, the cables should be no thicker than those used by USB 2.0. There will be a big difference in performance, however. USB 2.0 is like a single-lane country road that needs to handle the morning-commute traffic in and out of L.A. There are jams and slowdowns when too much data is going back and forth. With nine wires available, USB 3.0 has an additional two lanes of traffic in each direction to smooth the flow between the computer and the device.
Unlike USB 2.0, which requires synchronous transfers, where the data is asked for and then sent, the 3.0 host controller doesn't have to poll the USB device every time it wants to send data. This streamlines the flow with high-speed asynchronous transfers.
- An Insightful Approach to Optimizing Mainframe MLC Spend This paper discusses how you can penetrate the complexity of IBM mainframe MLC products and the MLC price model to gain insight into...
- Meeting the Exploding Demand for New IT Services In this eBook, explore the top trends driving the New IT for IT Service Management, and how leading organizations are evolving to focus...
- Hybrid IT-A Low-Risk Path from On-Premise to ITaaS This white paper provides a strategy to move part or all of your ITSM suite to the cloud as a stepping stone to...
- Paving the Windows XP Migration Path to Success Support for Windows XP has ended, leaving organizations with three choices: Windows 8, Windows 7 or a combination. With the right planning and...
- Increase Your Data Center IQ Discover how to improve network efficiency, lower IT costs and more proactively manage your physical, virtual and cloud environments.
- Optimize Data Center Resources and Plan for the Future Eliminate over-provisioning and capacity shortfalls with pro-active capacity optimization. Join us in the evolution from capacity monitoring to capacity optimization in your data... All Hardware White Papers | Webcasts