Usb 3.0

In: Computers and Technology

Submitted By suga0420
Words 1815
Pages 8
WHEN YOU'RE IN front of your PC, waiting for something to transfer to removable media, seconds can feel like minutes, and minutes like hours. And backups to USB 2.0 appear to crawl along at a snail's pace--so much so that users often become reluctant to perform that essential chore.
Such data-transfer scenarios are where the new SuperSpeed USB 3.0 standard and its theoretical, blazing-fast throughput of 5 gigabits per second--as promised by the USB Implementers Forum (USB-IF)--will change your life for the better. And if our tests of four new USB 3.0 hard drives from Buffalo Technology, Iomega, Seagate, and Western Digital are indicative, the change will certainly be dramatic.
USB 3.0's impressive speed is its raison d'être, part of its beauty is its backward compatibility with USB 2.0. You need a new cable and a new host adapter (or one of the new motherboards built to but support USB 3.0) to achieve USB 3.0 performance. But you can still use a USB 3.0 device on a USB 2.0 port and achieve typical USB 2.0 performance. You may also use USB 2.0 devices on a USB 3.0 port--though, again, with no gain in speed.
The technology behind USB 3.0 more closely resembles PCI Express than USB 2.0. Backward compatibility comes from clever connector design, and a dual bus. The designers added four data lines and a ground wire for the new USB 3.0 signals, and retained the existing pair of data lines for use with USB 2.0 devices. The two technologies share the existing power and ground wires, but they are otherwise completely separated.
As such, the USB 3.0 connector has design changes to accommodate the extra data lines. If you examine the inside of a type A USB 3.0 port with its familiar rectangular shape closely, you'll see that it shares the same size as a USB 2.0 port as well as the original fourUSB 1.1/2.0 contacts.
However, the port also has an additional five smaller…...

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