How is the SSD useful life span calculated?

The useful life of an SSD is governed by three key parameters: SSD NAND flash technology, the capacity of the drive, and the application usage model. In general, the following life cycle calculator can be used to figure out how long the drive will last.

• Life [years] = (Endurance [P/E cycles] * Capacity [physical, bytes] * Overprovisioning Factor) / (Write Speed [Bps] * Duty Cycle [cycles] * Write % * WAF) / (36 *24* 3,600)

1. Parameters: Endurance, NAND P/E Cycle: 100K SLC, 30K eMLC, 3K MLC
2. Capacity: Usable capacity of the SSD
3. Overprovisioning Factor: Overprovision NAND percentage
4. Write Speed: Speed of write-in Bytes per second
5. Duty Cycle: Usage duty cycle
6. Write %: percentage of writes during SSD usage
7. WAF: Controller Write Amplification factor