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 SSD owners who cant 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. The following results will show Crystal results using both compressible and incompressible data samples. The Z-R4 is on the left with the io-D on the right:
OFILL (COMPRESSIBLE) DATA SAMPLE UTILIZED
RANDOM (INCOMPRESSIBLE) DATA SAMPLE UTILIZED
In comparing the tests using both compressible and incompressible data, we see that the results of the Z-R4 drop a bit while the io-D remains consistent for the most part. This is a perfect example of our earlier discussion relating to SSD compression and testing fluctuations. As impressive as these scores are, the extremely high 4K-QD32 scores of the Z-R4 definitely stand out and provide a great impression of what we should be in for when testing IOPS.
Up until recently, ATTO 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 while using SandForce Driven SSDs as they use compression in storage as discussed earlier. Many enthusiasts like to AS SSD for their needs. Once again, the Z-R4 will be on the left with the io-D on the right. For these tests, however, we will display the results in bandwidth above with IOPS below.
Even mentioning a ‘worst case scenario’ seems a bit amusing when we speak of watching the Z-R4 pull off 2.3GB high sequential read disk access, 341, 094 IOPS read and 265,170IOPS write at 4k-64Thrd. Without even pushing the Z-R4 as we will do in our IOPS testing, its results are three times better than those put out by the io-D.