 The second source of over-provisioning comes from the manufacturer, typically at 0 %, 7 % or 28 %, based on the difference between the decimal gigabyte of the physical capacity and the decimal gigabyte of the available space to the user. As an example, a manufacturer might publish a specification for their SSD at 100, 120 or 128 GB based on 128 GB of possible capacity. This difference is 28 %, 7 % and 0 % respectively and is the basis for the manufacturer claiming they have 28 % of over-provisioning on their drive. This does not count the additional 7.37 % of capacity available from the difference between the decimal and binary gigabyte.
