The objective of this research is to justify the usage of buffers in High Technology Product Producing Factories (HTPPF) especially in the hard disk industry. This is significantly different from the trend in other industries such as canned food or car, where machines are joined and the process are continuous from start to end. In these latter industries, buffers are counted as stock and a waste, but in HTPPF, buffers are critical to enable research activities to achieve daily upgrade of the Key Quality Characteristics (KQC) of the product. This has enabled the hard disk industry to...