This research developed a simulation model, using FlexSim and applies it in a reader-writer
manufacturing for Hard Disk Drive industry to assign workforces to a reader-writer production line to
fit with production rates and product demand by considering 2 production layouts which are the layout
1 is discontinuous layout and the layout 2 is continuous layout. The main objective of this study is to
reduce labor costs and increase workforce utilization. Currently, average utilization is 58.5% under 21
working hours per day. After implementing the model, the first layout can reduce 4 out of 12 workers
per production line and average utilization increases 14.2% with 90,113 baht reduction in labor cost per
month. Layout 2 reduces 5 out of 12 workers per production line and average utilization increases 22.3%
with 112,641 baht reduction of labor cost per month.