Hitachi DZ-MV230A DVD Camcorder "mv350" Questions

Do I have to use the round DVD holder? Can I use DVD disc without the round DVD holder? No, The round DVD holder is necessary for using on DZ-MV350 or DZ-MV380. do i need a cd holder for my dz-mv380a

playback a DVD-R disc on the DVD Camcorder before the disc has been finalized? Yes: DZ-MV380 and DZ-MV350 provide playback capability with non-finalizing DVD-R disc