Seagate FreeAgent GoFlex 1.5TB Portable USB 3.0 HDD

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File Transfer Performance

To gauge the performance of the drive we conducted a series of file transfers from and to a 600GB VelociRaptor, arguably the fastest hard drive currently in production. We tested the drive connected to both USB 3.0 and USB 2.0 ports and compared the results to that of a WD Scorpio Blue 500GB using the same GoFlex adapter and connected to an internal SATA port.

So how fast is USB 3.0? Pretty darn fast compared to its predecessor. The GoFlex copied large files from the VelociRaptor more than 250% quicker when using USB 3.0. The drive inside the enclosure seemed quite speedy as well, beating the 5400RPM Scorpio Blue connected using the GoFlex USB 3.0 adapter and internally via SATA2. Its performance was surprisingly weak when dealing with large batches of small files though, even when both drives were tested using USB 2.0.

Read speeds were much better for all the drives/interfaces tested, and in this regard the GoFlex had no trouble with smaller files. These tests also show the Scorpio Blue on USB 3.0 was basically the same speed as when internally connected. In this scenario there wasn't much of a USB 3.0 bottleneck.

HD Tune Performance

HD Tune Benchmark: WD Scorpio Blue 500GB (SATA2).

HD Tune Benchmark: WD Scorpio Blue 500GB (USB 3.0 via GoFlex adapter)

Quick scans using HD Tune review hardly any difference between the Scorpio Blue connected via SATA2 and through USB 3.0 using the GoFlex adapter. It's eerie how the numbers are exactly the same except for a 0.1 ms increase in access time, and a loss of about 20 MB/s in burst speed with USB 3.0.

HD Tune Benchmark: Seagate GoFlex 1.5TB (USB 3.0).

The GoFlex drive on USB 3.0 has better overall read speeds and access times than the Scorpio Blue, even at the inner tracks where performance is typically very slow on large drives.

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