USB Flash Drive also known as USB stick, thumb drive, pen drive, jump drive, flash-drive or USB memory evolved from first generation to 2.0 and 3.0 standard and in 2015, 4th generation 3.1 standard was introduced.  The USB 3.0 interface specifies transfer rates up to 5 Gbit/s (625 MB/s) and USB 3.1 type-C flash drives gets read/write speeds of around 530 MB/s.

I was a little excited to get hold of a Lexar Jump Drive S75 128GB USB 3.0 Flash Drive as according to the product specifications it gives me Read Speed 150 MB/s and Write Speed 60 MB/s.  I thought I do not have to carry around an external hard drive containing utility software for my clients any longer.

Then I tested the Jump Drive using my PC’s USB 3.0 port transferring files to the drive and reading files on the drive.  It was not super fast but I felt much better than previous USB 2.0 generation drives.    So, I’ve decided to score the Jump Drive’s performance using famous Crystal DiskMark.  It gave me a surprising result as the below image.

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CrystalDiskMark 5.2.1 x64 (C) 2007-2017 hiyohiyo
Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

Sequential Read (Q= 32,T= 1) : 128.749 MB/s
Sequential Write (Q= 32,T= 1) : 96.680 MB/s
Random Read 4KiB (Q= 32,T= 1) :  5.103 MB/s [  1245.8 IOPS]
Random Write 4KiB (Q= 32,T= 1)   0.641 MB/s [   156.5 IOPS]
Sequential Read (T= 1) :       136.316 MB/s
Sequential Write (T= 1) :       98.146 MB/s
Random Read 4KiB (Q= 1,T= 1) :   4.139 MB/s [  1010.5 IOPS]
Random Write 4KiB (Q= 1,T= 1) :  0.579 MB/s [   141.4 IOPS]
Test:100 MiB [L: 6.6% (7.8/119.2 GiB)] (x5) [Interval=5 sec]
Date : 27/05/2017 9:41:29
OS : Windows 10 Pro  [1703 Build 15063.296] (x64)
Lexar Jump Drive S75 128GB USB 3.0

It’s actually giving me more than spec speed of writing capability.  Just for my curiosity I ran Crystal DiskMark on my operating system installed SSD (Solid State Drive).

It may not be fare to compare the speed between Jump Drive and SSD and I say it’s not a bad piece of item to have as it gives me enough storage and performance for any occasions.  Looking at a general description of the USB drive standard, I should be happy to have this piece in my hand.

From Wiki

“USB flash drives usually specify their read and write speeds in megabytes per second (MB/s); read speed is usually faster. These speeds are for optimal conditions; real-world speeds are usually slower. In particular, circumstances that often lead to speeds much lower than advertised are transfer (particularly writing) of many small files rather than a few very large ones, and mixed reading and writing to the same device. In a typical well-conducted review of a number of high-performance USB 3.0 drives, a drive that could read large files at 68 MB/s and write at 46 MB/s, could only manage 14 MB/s and 0.3 MB/s with many small files.
When combining streaming reads and writes the speed of another drive, that could read at 92 MB/s and write at 70 MB/s, was 8 MB/s. These differences differ radically from one drive to another; some drives could write small files at over 10% of the speed for large ones. The examples given are chosen to illustrate extremes.”

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