Regarding RAID NI HDD 8265

[ravitejashivuni]

I have one HDD 8265.I have installed all drivers and set up with the help of http://www.ni.com/tutorial/53938/en/#toc5 .The actual write speed is 750 MB/s but i am writting at the speed of only 250MB/S. Is there any other method to increase the write and read speed of HDD.