Legacy guarantees to provide compatible drives all other internal components for any configuration sold for a period of 5 years. This unique policy is provided to combat premature obsolescence. Many Server Centric Manufacturers limits the time that compatible disks or part upgrades are made available. The life cycle of certain disk drive models is becoming shorter and shorter. Server Centric Manufacturers sell certain disk model numbers for only a few months, then change to a new disk type or model. This often leaves the user without an upgrade path, forcing the customer to purchase an estimated capacity for the life of the system or application.