Harddisk had written data and there were stored custom icons for RocketDock.
I configured RocketDock and shutdown computer normally.
Next day I booted and saw configured RocketDock, but instead icons I found everywhere question marks - behavior when selected icons are missing.
So, I meant that it's config problem, opened items to select icons again and no one was found on the disk.
If you can help me how to check what is there problem, I will be very thankful.
1TB is not so low amount of storage space.
Miro