Solid State Drive Primer # 13 - Controller Functions - Over-Provisioning
The amount of Over-Provisioned area is generally set at the factory during the final low level formatting of the SSD. The typical percentages of Over-Provisioning are 0%, 7% and 28%.
An example of these percentages seen in the market would be a 128GB SSD which can be marketed as a 128GB with 0% Over-Provisioning, 120GB at 7% and 100GB at 28%. It is the same SSD with different amounts of “user-space” available.