A black dot in front of this command indicates whether the original file and folder names have been converted in accordance with ISO 9660 or whether the original name should be restored.
See also: Original
ISO 9660 allows 8.3 format file names (8 characters for the file name and 3 for the file extension) and 8-character directory names in Level 1. You can only use the characters A-Z, 0-9 and the underscore (_); special characters like §, $, % and & may not be used. The maximum number of directory levels is 8 (including the master directory).