Thank you Sir
I tried your solution.. but the same...there is no hard drive to install windows on it.
I do a copy-paste of my previous issue on Z820 because it's the same problem but on a different workstion, and i tries my previous solution on z820 hoping it will solve this one (( using z420 driveres)) but sadly not worked.
In addition when i set windows into x32... the hard shown but with an alarm.
Thank you again for your reply..and waiting another solution