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eSATA Flash Drive Performance Tests

Supercharge Your Flash Drive with eSATA

We used HD Tach RW version to test these drives. A Seagate Momentus 7200.2 160 GB hard disk drive was used to make speed comparisons. We ran each test a minimum of 10 times with reboots in between. Numbers listed here are averages.

Random Access

The random access measurement is the amount of time it takes for the drive to access randomly selected data on the drive, while the opposite of this is sequential access. So, if you had 10 numbered blocks ranging from 1 to 10 and placed them in order, the sequence would be 1, 2, 3 4, 5, 6, 7, 8, 9, 10 with sequential access. Conversely, random access might look like this, 3, 8, 1, 6, 5, 9, 2, 3, 10, 4, 7.

So, random access is a good estimate of the real-world access speed of a drive. Here are the random-access-speed test results:

Average Read

Using HD Tach’s full benchmark feature, available in the purchased version, we observed the following average read-speed test results.

Average Write

The write performance of a flash drive usually falls below the read performance. That is because, unlike a hard disk drive, which just writes over the old data, flash memory actually erases the data and then writes the new data. The processor requires an extra step, which results in slower performance.

Burst speed

Flash drives can “burst” performance at a maximum speed. This just shows the maximum possible performance for just a short time.

As you can see, the eSATA flash drives perform enormously better than USB flash drives do. 

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