Hi,
I have Dell Inspiron 15z 5523. I'm facing issue while configuring IRST on my system. It shows me following error " An unknown error occurred while an operation was in progress. The operation could not be completed ". I'm able to create two RAID 0 Arrays successfully, however I'm not able to select the device that needs to be accelerated(which is the hard disk drive). It shows the status as Accelerated Device : None, Accelerated Mode : None. I called Dell Customer Care 'n' number of times, but no one is helping me out with this issue. I'm facing this problem from past 2 months 
. I already installed 10 x times and tried almost all the way the Dell Representative guided me. Help me out please . I want to use my system 