[section_title title=Performance]


The samples we received are the 32GB versions, referring to 32,000,000,000 bytes. They are both pre-formatted in FAT32 and Windows of course translates the size into the binary sizing system so shows as 29.8GB with around 50MB already in use straight out of the pack due to the included software (which I’ll come back to later).

jumpdrive s75 size

As we saw in the features and specifications, the rated transfer speeds are 150MB/s read and 60MB/s write for the 32GB Jumpdrive S75 and 450MB/s read 100MB/s write for the 32GB version of the P20. Of course, those rated speeds are often theoretical or at least tested in ideal circumstances, but how does it rate when tested on a ‘normal’ computer with all the extra software and running applications that can sometimes leech some of that performance?


AS SSD Benchmark is a straightforward tool for measuring the speed of your SSD drive. Simply launch the program, choose your drive, click Start, and it’ll test your SSD’s read and write speed in a variety of ways, delivering a score for each when it’s done. And if that’s not enough, there are also additional file copy and compression-related benchmarks available from the Tools menu. (The author’s support page is German only, but if you need further English explanations then there’s a thread on the program at the OCZ Technology forum.)

ATTO ReadAS SSD Seq Write


ATTO Disk Benchmark performance measurement tool is compatible with Microsoft Windows. Measure your storage systems performance with various transfer sizes and test lengths for reads and writes. Several options are available to customize your performance measurement including queue depth, overlapped I/O and even a comparison mode with the option to run continuously. Use ATTO Disk Benchmark to test any manufacturers RAID controllers, storage controllers, host adapters, hard drives and SSD drives and notice that ATTO products will consistently provide the highest level of performance to your storage.



CrystalDiskMark is a disk benchmark software that analyses different types of hard drive. Giving sequential benchmark write and read statistics in MB/s. A simple program that is very useful.

CDM Read CDM Write


The Jumpdrive S75 is of course the budget option from Lexar, at least as far as these two samples are concerned, but it does really well in the benchmarks keeping within a tiny margin of it’s rated read speed and exceeds it in Crystalmark, write speeds are a different matter though, scoring around two-thirds of it’s anticipated 60MB/s. As a real-world test, I transferred a 400Mb AVI file to the S75 which took 12 seconds.

Lexar’s P20 again also scores really well on our read tests, not only matching (and once beating) it’s rated speed but also putting it at the top of all of our previous USB3 flash drives across the benchmarks. Again though, write speeds are a little disappointing with the drive being lowest of the crop of our ‘fast drives’ in all our tests. As a real-world test, I transferred the same 400Mb AVI file to the P20 which took 4 seconds, which really highlights the difference between these two.

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