Atto Disk Benchmark
The Atto Disk Benchmark reads and writes data blocks of different sizes as quickly as possible to random places on the SSD. We used the 4kB and 1MB tests. The 4kB tests reflect working with very small files, resembling what happens when starting up software. The 1MB test are a best-case scenario for SSDs and indicate what type of performance you can expect when working with large files, such as copying digital photos, MP3s, and films.
Four commands are simultaneously sent to the disks each time. Since the flash chips in SSDs are parallel controlled, smart controllers can execute multiple commands at once. This improves the performance. In real-life, Windows and other software will also simultaneously send multiple commands to the drives.
Please note: Atto Disk Benchmark uses compressible data. Many files - especially programme files - are like this. However, files such as digital photos, MP3s, or films are barely compressible or not compressible at all. The AS SSD benchmark on the next page provides a clearer picture.
The SX300 scores about the same as the SX900, about 135 MB/s. The mSATA version of the m4 takes the lead in the 256 GB chart, like its SATA counterpart.
With writing 4k blocks the SX300 is faster than the 2.5-inch version, interestingly. The m4 again performs very well.
Reading 1 MB data blocks is an indicator of the maximum transfer rate in practice. Both mSATA SSDs get close to the maximum speed of the SATA600 bus.
The 1MB write test is an indicator of the maximum possible transfer rate for writing. Again, Atto works with compressible data so it's no surprise that the SandForce-based Adata SX300 scores very well here. The mSATA version of the m4 is again at the same level as its normal counterpart, and this test is not the strongest side of this SSD.