In the past I've always been given my SQL servers pre-built with one RAID 5 array. Moving forward I've decided to implement my arrays as indicated in this his Q&A answer: http://www.sql-server-performance.com/q&a38.asp (RAID 1 OS, RAID 5 or 10 data, RAID 1 logs). My questions are: 1) When installing the "SQL Server binaries" on the RAID 1 array does that include the system databases? 2) Or do you locate the system databases on the RAID5/10 data array? 3) If the latter, how is that accomplished (i.e., during installation or manually after)? Thanks!