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Getting terrible 4K read and write speeds on Inspiron 7559 scandisk Z400s drive

I have a scandisk Z400S in my Inspiron 7559 and according to, I am getting terrible 4k read and write speeds. 

My 4k read speed is about 8MB/s(average for all Z400S's benchmarked on is 24 MB/s), and my 4k write speed is about 25 MB/s(average is 84 MB/s).

The only possible cause might be that I seem to have some trouble installing the latest I/O driver from the dell website. 

The installation says it completes successfully, but then Dell Update continues to suggest the driver as if it did not install correctly. 

Aside from this, I have install successfully all over recommend drivers from Dell, in the recommended order. 

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