Disk estimation for Sterling Warehouse Management System provides a methodology to estimate your initial disk requirements. By using this worksheet and then tracking your actual database usage over time, disk growth will be easier to anticipate.
In recent years, the cost of disks has dramatically decreased and the capacity and speed of disks has increased. Information system managers who order disk capacity have shifted from purchasing disk arrays that are dedicated to a particular database server and project to the use of Storage Area Networks (SANs).
Consider the confidence that you have in your data estimates when making the final purchase decision and adjust accordingly. After your initial purchase and production deployment, you can track disk growth for future purchase forecasts.