Output after another code modification:
atomasz@debian:~/instal/dvd+rw-tools-7.1$ ./growisofs -use-the-force-luke=moi -Z /dev/hdc /mnt/hda6/WinFast\ WorkArea/Poszukiwacze\ Czindici2.avi /mnt/hda6/WinFast\ WorkArea/odessa.avi /mnt/hda7/WinFast\ WorkArea/JFK.mpg /mnt/hda7/WinFast\ WorkArea/Nieukończony\ cud\ 2.mpg
WARNING: /dev/hdc already carries isofs!
About to execute 'mkisofs -quiet /mnt/hda6/WinFast WorkArea/Poszukiwacze Czindici2.avi /mnt/hda6/WinFast WorkArea/odessa.avi /mnt/hda7/WinFast WorkArea/JFK.mpg /mnt/hda7/WinFast WorkArea/Nieukończony cud 2.mpg | builtin_dd of=/dev/hdc obs=32k seek=0'
/dev/hdc: "Current Write Speed" is 8.2x1352KBps.
27951104/4220336128 ( 0.7%) @5.9x, remaining 14:59 RBU 100.0% UBU 3.8%
55607296/4220336128 ( 1.3%) @6.0x, remaining 11:14 RBU 100.0% UBU 80.8%
83296256/4220336128 ( 2.0%) @6.0x, remaining 10:45 RBU 100.0% UBU 80.8%
110985216/4220336128 ( 2.6%) @6.0x, remaining 9:52 RBU 100.0% UBU 69.2%
138706944/4220336128 ( 3.3%) @6.0x, remaining 9:19 RBU 100.0% UBU 73.1%
166428672/4220336128 ( 3.9%) @6.0x, remaining 9:20 RBU 100.0% UBU 80.8%
194117632/4220336128 ( 4.6%) @6.0x, remaining 8:59 RBU 100.0% UBU 84.6%
221806592/4220336128 ( 5.3%) @6.0x, remaining 8:42 RBU 100.0% UBU 80.8%
232062976/4220336128 ( 5.5%) @2.2x, remaining 9:27 RBU 100.0% UBU 80.8%
248315904/4220336128 ( 5.9%) @3.5x, remaining 9:35 RBU 100.0% UBU 15.4%
264568832/4220336128 ( 6.3%) @3.5x, remaining 9:43 RBU 100.0% UBU 23.1%
280690688/4220336128 ( 6.7%) @3.5x, remaining 10:03 RBU 100.0% UBU 23.1%
296386560/4220336128 ( 7.0%) @3.4x, remaining 10:09 RBU 100.0% UBU 15.4%
312410112/4220336128 ( 7.4%) @3.5x, remaining 10:12 RBU 100.0% UBU 15.4%
...
4149411840/4220336128 (98.3%) @3.7x, remaining 0:14 RBU 100.0% UBU 11.5%
4165959680/4220336128 (98.7%) @3.6x, remaining 0:11 RBU 100.0% UBU 15.4%
4182147072/4220336128 (99.1%) @3.5x, remaining 0:07 RBU 100.0% UBU 26.9%
4210491392/4220336128 (99.8%) @6.1x, remaining 0:02 RBU 29.4% UBU 23.1%
builtin_dd: 2060720*2KB out @ average 3.6x1352KBps
/dev/hdc: flushing cache
/dev/hdc: stopping de-icing
/dev/hdc: writing lead-out