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This hard disk circuit board is designed for SA 3.5" SATA hard drives, with strict version matching: BF41-00XXXA, M7U 339 REV.02A R00, and integrated main control chip 88i8922E-TFJ2. It effectively fixes common failures such as no power, no spin, and undetected drive status. Each board is fully tested for safe and stable operation. Ideal for hard drive repair and data recovery projects. Please note that the original BIOS chip transfer may be required for proper use.