Next goes our homemade test of defragmentation speed. We created a very defragmented file system on a 32GB partition of a disk by loading it with music, video, games and applications. Then we saved a per-sector copy of it. Now we copy that partition to the disk we want to test. We run a script that evokes the integrated defragmenter of Windows 7 and marks the time of the beginning and end of the defragmentation process. For more information about this test, you can refer to this article.
We must remind you that defragmentation is useless and even harmful for solid state drives due to their operation principles. However, we use this test as it allows to benchmark their performance at a rather peculiar load that involves both reading and writing of small data blocks.
This test often produces unpredictable results but this time around it agrees with what we've seen earlier. The quad-controller models are good, especially if each of their SF1200 controllers has all of its eight channels filled with memory chips. The only surprise is the large difference between the RevoDrive x2 and the IBIS 100 GB.
Performance in WinRAR
Now we are going to show you one more interesting test in which we use WinRAR version 3.91 to compress and then uncompress a 1.13GB folder with 8118 files in 671 subfolders. The files are documents and images in various formats. These operations are done on the tested drive. This test depends heavily on CPU performance, but the storage device affects its speed, too.
The 18 seconds of difference between the best and worst runners amount to less than 3%. Although we test each SSD under the same conditions, it’s hard to say whether some variations in speed are due to their performance or to some random factors. So, in this test we are inclined to view all the SSDs as delivering the same performance.
The difference is large when the SSDs are used for unpacking the archive. We’ve got a group of leaders including large-capacity SSDs and a pair of losers with too few memory access channels.