Analyse and report disk usage growth historically Is it possible to use historic information to show disk usage growth?

I haven't keep much in the way of database setup and disk usage information. So I can't say how much disk growth has occurred in the last 6/12/18 months. 

Can I reconstruct that picture from info stored somewhere in SQL Server?
If your DBs reside on a SAN or other shared storage that platform may have logs you can reference.  For local storage I know of nothing held by default.

A couple of years ago we started tracking DB size and disk free/used space. It has proved very valuable.  A couple of Powershell scripts, a scheduled task and a small table has helped us avoid several incidents.  Eventually we had enough data to make Monte Carlo prediction workable.