If there is no any special need return to IDE mode (would not affect drives speed, but will cure the situation).
(not all ODD are born equal - some do not support AHCI mode to full extent)
Didnt help either...
Problem is in motherboard, I have ASUS P5K Premium.
It has HUGE SATA problems and latest BIOS does not resolve all.
I tried AHCI mode on Gigabyte MB I have, it works there.
So never again ASUS... At least not soon...
Thanks for help.