The synthetic tests determine the sequential and random read and write performance of the SSD. These tests are conducted without using the operating system caches. In Seq test the program measures how long it takes to read a 1 GB file respectively to write. In the 4K test the read and write performance at randomly selected 4K blocks is determined. The 4K-64 THRD test corresponds to the 4K procedure except that here the read and write operations are spread over 64 threads. This test should represent at SSDs with Native Command Queuing (NCQ) differences between the IDE operation mode where NCQ is not supported, and the AHCI mode. The additional compression test can measure the performance of the SSD as a function of compressibility of the data. This is especially for the controllers that use to increase the performance and life of the cells compression, important.
In the first three synthetic tests and the compression test, the size of the test file is 1 GB. Finally, the access time of the SSD is still under investigation, the access in reading over the entire capacity of the SSD (Full Stroke) is determined. The write access test, however, is carried out with a 1 GB large file test.
At the end of the test three values for the read and write as well as the overall performance is output. The results of the compression tests are output as graphics. The X axis thereby indicates the compressibility of the data. 0% – not compressible, to 100% – fully compressible. The Y-axis represents the achieved data rate. In addition, the calculated values indicate in MByte / s can represent in IO per Seconds (IOPS). The formula for the scores are as follows:
In the copying test (menu Tool Copy Benchmark) test following folders are created: ISO (two large files), programs (typically Program Files folder with lots of small files) and Games (folder of a game with small and large files). These three folders are copied with a simple copy command of the operating system. The cache remains switched on for this test. The practical tests show the performance of SSD with simultaneous read and write operations. The results may vary depending on the Windows OS.
It is gemssen the reading and writing speed in dependence of the compressibility of the data. These targeted zeros are interspersed with random data. The zero spaces compressible, the random data are practically not compressible
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