Firstly I'm sorry for my bad english.I want burn CD-R with two separate tracks contains my own binary data ( track1.bin and track2.bin). Probably it has to be in track-at-once mode. J want have a little space without recoded data between tracks like audio CD's track-at-once burned have. I can record first track1.bin in Nero (burn image, track-at-once, multisession, leave session open) but when I want burn track2.bin Nero can't do it or record it simply like file, not like track with my data. Thanks for all answers

I suspect that track1.bin is an image of a closed/finalised cd. If so, the disc will be closed once you've burnt that image irrespective of whether or not you've elected to use multi-session and sought to leave the disc open.

I want explain some things.I made compilation my 700MB movie in Nero into *.nrg image file, inserted it to DaemonTools emulator, opened virual disc in IsoBuster and dumped existing track to MyTrack.tao (for example). Next I divided it into 2 parts by binary HexEditor, changed names to part1.iso and part2.iso (Nero not accept names like *.tao).First part of burn (part1.iso) I burned without troubles ,in Windows Explorer my disc looks like standard DivX movie (name, extention, size 700MB are corect), I can play it directly from CD drive but copying is only to end of recorded track (around half file). Now, when I try add second track in "file mode" due to your advise, folder of burned this way disc "contains" 2 files: DivX.AVI and part2.iso and movie is "not playable". In which way should I burn my second track in "file mode" (or maybe another way exist) and Nero will not write any info about it into TOC ?