Instant File Initialization (IFI) is an interesting topic with regards to how SQL Server works with storage. It is an easy feature to turn on and can improve the performance of your server; specifically with creation and growth of data files including TempDB rebuilds with SQL Server restarts. There is a slight security risk where a professional data thief could potentially recover bits of data that have not been over written since IFI was turned on, but the chances of that happening are slim. Plus, if they have physical access to the hard drives on your server, you will have bigger problems to fix.
So without further ado here is the next delicious SQL Snack for Instant File Initialization: