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Samsung 840 EVO 128GB mSATA SSD Review

By: Chris Ramseyer | mSATA in Storage | Posted: Jan 8, 2014 3:00 pm
TweakTown Rating: 92%Manufacturer: Samsung

HD Tune Pro


Version and / or Patch Used: 4.00

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HD Tune is a Hard Disk utility which has the following functions:


Benchmark: Measures the performance

Info: Shows detailed information

Health: Checks the health status by using SMART

Error Scan: Scans the surface for errors

Temperature display


HD Tune Pro gives us accurate read, write, and access time results. It is now considered a must-have application for storage device testing.





We shouldn't run into any issues today with the Samsung 840 EVO mSATA 120GB when it comes to read performance. This drive should actually be brilliant when reading both sequential and random data. On the sequential side: at QD1, we achieved an average read of 440 MB/s with the 64KB block size.




When writing 64KB blocks, we see how write performance can drop off with sequential data. Let's look at the actual trace to see what's happening.




Here we see Turbo Write caching the write, but unlike the 1TB model, the 120GB capacity size has a very small SLC like buffer area. When we get through the SLC area, the 64KB sequential write performance drops down to between 140 and 150 MB/s.


HD Tach - Sequential Performance after Random Writes




In this test, we use the 128KB block size, and run the test after a consumer appropriate level of random writes. This is where things get funky. We didn't hit the drive very hard with random writes, but the performance still dropped below 50 MB/s for the final 1/3 of the test.

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