RAID levels have nothing to do with drive speed. People were RAIDing back in the 5400 RPM days too. For long-term mass storage, 7200RPM is still standard. I believe virtual machine environments typically run on 10K, while databases may more typically be placed on 15K or SSD now, depending on the application and need. It's a dynamic decision that is part of the planning stages.How is it Enterprise class RAID with 7200 RPM drives? The servers we run RAID on are running 10k or 15k RPM drives.