Re all!
Good news. When I've read what maxtor said about the sound signal (spinup error), and all the other posts, I tried to tap the HD softly too. Not with a rubber hammer, 'cause my one is at home, but with my hand, realy softly. When I put it back, it beeped a little when got power the first time, but after that it spinned up, and worked fine. So I saved all of my data to another HD, and now run the maxblast read/write tests for at least 3 days to see if it crashes again ;]