Due to tremendous growth of computer related business during late 1990’s, demand for hard drives has increased rapidly. Seagate Technology (Thailand) Ltd. is Seagate’s manufacturing chain in Southeast Asia where one hundred percent of HGA’s (Head Gimbals Assembly) and HSA’s (Head Stack Assembly) are produced and assembled. In 1999, based on previous systems used, time to detect tester low yield and tester set up errors was about a day. This caused a loss of HGA scrap around $50K per month. Seagate lost about $5K per month for wrong tester setup. The problem was due to the fact that test and/or process engineers only could see production yield results one hour after end of each production shift. This generated a need for having real time monitoring system that could detect both low performance electrical testers and low performance wafer loading in the production line.
Kulawongvanich, Arnon; Pringsulaka, Proadpan; Kantawat, Peerawut; Krishna, Sudha; and Kadavy, Dale, "Real Time Object Oriented Tester Monitoring Program" (2003). Engineering and Technology Management Student Projects. 1522.