SQL Server 2005 I/O Basicshttp://sqlserver.ro/blogs/cristians_blog/archive/2006/09/21/129.aspxThis is a must see white paper written by Robert Dorr ! I won't say more but if you are a serious dba then you've got to read this: SQL Server I/O Basics, Chapter 2enCommunityServer 2.1 SP2 (Build: 61129.1)