Rozszerzanie partycji niesystemowej za pomocą HP ACU

The solution in simple words:

1. check for Array Config Utility (ACU) exist (generally in start menu/HP system tools)
2. if not, download the latest version from http://www.hp.com/ -> software and driver downloads
3. if you dont have ACU, its means, maybe the drivers and firmwares are not the latest ones, so if there is not any company policy abt that, make a full backup, and update the drivers and firmware for storage controller (read the readme first, sometimes the hard drive firmware needs to update also, and beware, many times needs to install the new driver first!, the firmware just after!)
4. make a full backup and check it!!
5. run ACU, select the array and choose expand from the right (if needed),
6. select the Logical Drive, and expand it also
7. save the configuration to raid controller
8. open disk manager from windows, and rescan hard disks, if you didnt made any mistakes, the hard drive looks bigger (space apear after partition).
9. Use diskpart.exe, to expand the partiton, it takes 1 second.
diskpart
list volume
select volume
extend

Voila