Writing a first session of at least 1GB helps maintain compatibility of your recorded data with other optical drives. This is because the DVD players calibrate themselves by attempting to read from specific locations on the disk; you need data there for the drive to read it and calibrate itself.
Also, because of limitations to the ISO9660 file system in Linux, do not start new sessions of a multisession DVD that would create a directory past the 4GB boundary. If you do so, it causes the offsets used to point to the files to "wrap around" and point to the wrong files.
Packet writing treats the DVD disk like a hard drive in which you create a file system (like ext3) and format the disk, and then write to it randomly like a conventional hard drive. This method, although commonly available on MS Windows-based computers, is still experimental for Linux and is not yet covered in detail here.
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