How big should a slice be for a DVD, assuming that the file system restricts the size?
should slices be 1GB or so? What's an efficient slice size?
According to the Wikipedia article,
So a slice can be as large as a DVD (about 4.3 GB binary for a single-layer disc).
Limited file size
If, for whatever reason, you need to limit the file size to no more than max_file_size and the disk holds disk_size, make your slice size the largest disk_size / s less than max_file_size, where s is an integer. That way, you can fit s slices on the disk exactly (ignoring round-off error), wasting no space. For disk_size ≈ 4.3 GB and max_file_size = 1 GB, you could then make each slice 880 MB, fitting 5 slices per disc.