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  1. or download this
    +----+----+----+----+----+
|    |XXXX|XXXX|XX**|    |
...
|    | = Disk block
  XX   = File
  **   = Wasted space
  2. or download this
    use POSIX qw( ceil );
$filesize = ceil($filesize / BLOCK_SIZE) * BLOCK_SIZE;
  3. or download this
    # Space for directories. No idea what's reasonable.
use constant DIR_BUF => 64*1024;

use constant DVD_CAP => 4707319808 - DIR_BUF;