USB 3.0 Flash Drives

With the arrival of SuperSpeed USB 3.0 last year, we saw the first wave of add-on controllers, on board controllers,and external hard drives for the new interface. With these, you could have gobs of storage with an interface able to move data at SATA-class speeds. USB 2.0only provided 60MBps raw transfer rates,but in the real world, after accounting for overhead, data rates rarely exceeded36MBps. Now, USB 3.0 rockets the raw rate to 640MBps. After overhead, rates of 400MBps remain allegedly feasible,provided there’s no bus limitation. In theory, USB 3.0 should exceed the performance of eSATA,which hasn’t gained much traction in the portable peripherals market. In any case, USB 3.0 is fast enough that the media’s internal transfer speed (disk platter to drive controller, for example), not the drive interface, may become the primary storage bottleneck. That much is the good news, and we’ve enjoyed having a variety of USB3.0 hard drives to choose from. However, SuperSpeed flash drives have been slower to reach the market, and this is a problem for anyone who’s waited impatiently to pour gigabytes of data to or from a flash drive. Cloud storage has capacity, but transfer speeds are too slow for truly large file batches. Portable drives based on 2.5-inch hard drives now store up to 1.5TB, but these remain too big to carry everywhere .Most still use slow USB 2.0 interfaces. Computer repair Las Vegas done right!







CPU | June 2011 p.22

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