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This listing is for 1 piece of Samsung notebook hard disk circuit board (PCB), part number BF41-00200A WT1 REV03 R01. Specifically designed for HM500LI and HM400LI series SATA 2.5-inch hard drives, it serves as a critical logic board for power management and data control[5]. Each board undergoes rigorous testing to ensure reliable performance. Note that ROM chip transfer from the original PCB is mandatory for successful hard drive operation, as each unit contains unique firmware data essential for functionality[9]. Perfect for data recovery and hard drive repair scenarios such as no power, no spin, or PCB damage.