The space used stats can be stale. This is particularly true in SQL Server 2000, and still apllies to a lesser extent to SQL 2005.
It is worth running DBCC UPDATEUSAGE maybe on a weekly basis if you want figures to rely on.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara