Crystal Disk Benchmark is used to measure read and write performance through sampling of raw (0/1 Fill/compressible) or random data which is, for the most part, incompressible. Many new ‘SandForce Driven’ SSD owners who can’t wait to test the performance of their SSD often grab this program and run a quick test, not realizing that they are testing with incompressible data rather than compressible data used in testing by manufacturers.
Once again we see the Aura Pro on the left with the Samsung on the right. We have switched things up a bit and provided highly incompressible data samples for testing in order to clearly display where both drives differ. We see that the Samsung high sequential and 512k write results are much better than the Aura Pro and this is because the Samsung does very well with incompressible data for specialized tasks such as photography, video or music composition.
Something else stands out that should be recognized and it is consistent with both of these SSDs as well as the Toshiba SSD that we tested on the same MBA.. As much as we value our low 4k write performance that commonly reaches 100MB/s in PCs, breaking the 40MB/s mark in the Mac environment, or at least dual OS x/Win7 environment that we test in, seems to be impossible.
The result for compressible/incompressible testing does not change for the Samsung, however, we thought it appropriate to include the OWC Mercury Aura Pro CDM result with highly compressible data samples:
Up until recently, AS SSD was the only benchmark created specifically for SSD testing and it uses incompressible data. AS SSD, for the most part, gives us the ‘worst case scenario’ in SSD transfer speeds because of its use of incompressible data and many enthusiasts like to AS SSD for their needs. Transfer speeds are displayed on the left with IOPS results on the right.
Once again we can visibly see that the Samsung excels in high sequential write performance but the Aura Pro then surpasses the Samsung on most other transfer speeds resulting in the better Total Score.
AS SSD Copy Bench is a great evaluation tool for comparing performance as it creates three files and simply measures the highest transfer speed reached and time it takes to move each file from one spot on the SSD to another. With respect to the speed, only the Aura Pro displayed SATA 3 speeds while the transfer times of both was very similar.