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.

As you see above the drive's reading and writing performance with compressible files was pretty stable with files larger than 64KB. The reading speed hit the 340MB/s while writing reached the 208 MB/s. Both figures are lower than those quoted by Lexar and generally low for a 512GB SSD.

The drive also seems to suffer in tasks needed to access or write small 4KB files: