Not all profiles are applicable for disc, we always performs disc formatting during full erasing, but we enumerate all profiles and select a really applicable before call formatting routine. Using inapplicable profiles may cause formatting failure or decreasing read/write speeds.
Also we check disc before write ( formatted or no ) and format it if required.
1. You don't need to call full erase or format before first write.
2. You can use fast erase instead of full before each next writing, be sure your burning will completed successfull
Use full erase when you need zerofill confidential information on media only ( to avoid reading and parsing with lowlevel reading tools ), otherwise use fast erase.