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rmkoske - the following characters are not allowed in Windows file names
< (less than)
> (greater than)
: (colon)
" (double quote)
/ (forward slash)
\ (backslash)
| (vertical bar or pipe)
? (question mark)
* (asterisk)
If you have them in book titles calibre will replace with '_' (underscore) when creating folder/file names derived from book titles
Windows also places restrictions on path lengths, so calibre has to truncate long titles. I put subtitles and straplines into a separate custom column. Basically I strip the title down to its 'essentials' no straplines, no dates, no publisher, no series like data etc.
What does your save to disk template look like?
Not sure what you second post is referring to, your first post is fine.
BR