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We model different performance of disks based on IBM 9LZX manufactured in progressively order years.
| Age (years) | Bandwidth (MB/s) | Seek avg. (ms) | Rotation avg. (ms) |
|---|---|---|---|
| 0 | 20.0 | 5.30 | 3.00 |
| 1 | 14.3 | 5.89 | 3.33 |
| 2 | 10.2 | 6.54 | 3.69 |
| 3 | 7.29 | 7.27 | 4.11 |
| 4 | 5.21 | 8.08 | 4.56 |
| 5 | 3.72 | 8.98 | 5.07 |
| 6 | 2.66 | 9.97 | 5.63 |
| 7 | 1.90 | 11.1 | 6.26 |
| 8 | 1.36 | 12.3 | 6.96 |
| 9 | 0.97 | 13.7 | 7.73 |
| 10 | 0.69 | 15.2 | 8.59 |
