The next software we used was the ATTO Disk Benchmark. The tool measures storage systems performance with various transfer sizes and test lengths for reads and writes. The benchmark performs file transfers ranging from 0.5 KB to 8192 KB. ATTO can be adjusted to do overlapped I/O, in a variety of queue depths. We tested the SSD using the benchmark's default settings, using 256KB file length performance and QD4. ATTO probably gives the most accurate results for compressible read and write data.

ATTO shows us a high of 500MB/s read and 432MB/s write. The read speed surpasses the rated spec of 480MB/s and write is the same of the rated 430MB/s.

Let's take the performance with 4KB files. The OCZ ARC 240GB SSD was not very fast in the reading part and was placed between the Crucial MX100 and the smaller Micron MX 600 128GB SSDs:

Writing of small 4KB files was fast at 245.3 MB/s:

Going further to larger 2MB file transfers, the OCZ ARC 100 SSD was fast in both the read and write tests, performing according to its specs.