PCPer File Copy Test
Our custom PCPer-FC test does some fairly simple file creation and copy routines in order to test the storage system for speed. The script creates a set of files of varying sizes, times the creation process, then copies the same files to another partition on the same hard drive and times the copy process as well. There are four file patterns that we used to try and find any strong or weak points in the hardware: 10 files @ 1000 MB each, 100 files @ 100 MB each, 500 files @ 10 MB each and 1000 files at 1 MB each.
Well now, those figures are certainly impressive. File creation and copying for the 512 and 1TB models is right up there with the Intel SSD 730's fire breathing overclocked enterprise controller. The 256GB and 128GB models progressively fall off as the available die count is reduced by those lower capacities (meaning the controller has less dies to spread writes across, which slows ultimate write speeds). The older SandForce driven SX900 is handily beaten, yet still bests the SP920 of the same capacity – most likely due to the fact that our copy test is compressible data and the SandForce controller is not physically writing as much data to its flash in order to achieve the measured speed.