Good for you!
Recently, I bought this drive and decided to test it. I was most interested in his ability to compress data, because in this thread I read about it. In order to evaluate the effectiveness of the compression algorithm, I first wrote compressible data on the SSD, and then wrote incompressible data. In each case, I recorded changes in two SMART indicators: "Total LBA's written" and "Total NAND writes". I expected that in the first case the difference between these indicators will be much greater than in the second. But the indicators behaved similarly in both cases. Why is that? Am I measuring the compression algorithm incorrectly?
Below I provide detailed information.
Before the experiment, I filled the drive with high entropy data, leaving 13% of free space. Next, I fixed the SMART indicators, after which I wrote a large file with low entropy (7zip can compress it 10 times) with a size of 49GB. Then I again recorded SMART indicators, after which I deleted the previous file and wrote 7 files with high entropy (compressed with 7zip) with a total size of 42GB.
In the first case, "Total LBA's written" indicator increased by 49GB, and "Total NAND writes" indicator - by 44GB. In the second case, the first indicator grew by 42GB, the second - by 36GB. That is, in the first case the ratio is 90%, in the second - 86%. Why is the first coefficient so large if data with very low entropy were written? Why is the second coefficient a little less than the first?
Clik here to view.
