I have been looking at all the logs and there is no evidence of the deletion / removal of these```
E:\plexdata\plexmovies3\Happiest.Millionaire.1967\Happiest.Millionaire.1967.avi
E:\plexdata\plexmovies3\Snowball.Express.1973\Snowball.Express.1973.avi
They were there as from Feb 01, 2018 11:46:31.
The preceding scan was at Jan 29, 2018 23:36:51 and they were not there
The oldest server log goes back to Feb 01, 2018 20:01:23
The oldest scanner log goes back to Jan 27 2018 22:24:12
You had 4 paths defined for the library
C:\Users\mediaman\Videos\plexmovies1
D:\plexmovies1
D:\plexmovies2
E:\plexdata\plexmovies3
The first path C:\Users\mediaman\Videos\plexmovies1 did not exist throughout the period in the logs
The fourth path E:\plexdata\plexmovies3 which is the path that you added the lost movies to, had permissions issues / files inaccessible at various times
Jan 29, 2018 23:33 permissions issues with E:\plexdata\plexmovies3\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb.mkv
Jan 29, 2018 23:35 permissions issues with E:\plexdata\plexmovies3\Men.in.Black.1997\Men in Black (1997).mkv
Jan 29, 2018 23:33:36.535 [10080] ERROR - Error opening file 'E:\plexdata\plexmovies3\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb.mkv' - Permission denied (13)
Jan 29, 2018 23:33:45.035 [6236] ERROR - Error opening file 'E:\plexdata\plexmovies3\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb.mkv' - Permission denied (13)
Jan 29, 2018 23:33:45.039 [6236] ERROR - Exception analyzing media file 'E:\plexdata\plexmovies3\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb.mkv' (Could not parse E:\plexdata\plexmovies3\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb\Men.In.Black.3.2012.1080p.BluRay.DTS.x264-NTb.mkv (error=-13): Permission denied)
Jan 29, 2018 23:35:39.941 [4764] ERROR - Error opening file 'E:\plexdata\plexmovies3\Men.in.Black.1997\Men in Black (1997).mkv' - Permission denied (13)
Jan 29, 2018 23:35:46.424 [4796] ERROR - Error opening file 'E:\plexdata\plexmovies3\Men.in.Black.1997\Men in Black (1997).mkv' - Permission denied (13)
Jan 29, 2018 23:35:46.426 [4796] ERROR - Exception analyzing media file 'E:\plexdata\plexmovies3\Men.in.Black.1997\Men in Black (1997).mkv' (Could not parse E:\plexdata\plexmovies3\Men.in.Black.1997\Men in Black (1997).mkv (error=-13): Permission denied)
You could run with a large number of log files - the default is 6 log files for each category but you can change that by RegEdit and if logs captured as soon as you notice movies disappearing then there would be a chance to capture the removal in the logs. Drive Failure / Drive unavailability / Access issues impact is minimized if empry trash after every scan is not ticked
To increase logs, RegEdit
and select HKEY_CURRENT_USER\Software\Plex, Inc.\Plex Media Server
and right click on Plex Media Server and select New / REG_DWORD (32-bit) and create item and name it LogNumFiles and give it a value of, say 30 decimal for 30 log files
