I have been working on SharePoint 2013 lately and was wondering why so much HD space is disappearing.
It appears the SharePoint_Config_Log was very large (over 40gb).
The link below will help you with solving this problem.
(I give full credit to the website owner above however if you need the fix I will paste it below)
1.Open up Microsoft SQL Server Management Studio
3.Type in the following and press execute.
ALTER DATABASE[SharePoint_Config] SET RECOVERY SIMPLE WITH NO_WAIT
DBCC SHRINKFILE (‘SharePoint_Config_Log’)
Log has now shrunk 🙂