Aged disk storage systems are simulated for testing and evaluation purposes by writing test data to a clean disk using a data allocation policy that writes the test data to mimic the data layout and data distribution of the aged disk to be simulated. The test data may be written using a sequential data block allocation on the disk where blocks are written sequentially to the fresh, or by using either a fixed or a random jump allocation policy where test data is written in data blocks spaced from each other by either a fixed increment or spaced from each other randomly.