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This HDD PCB is a direct replacement for Seagate 2.5-inch SATA hard drives, compatible with models ST9250421AS and ST9320421AS. It supports multiple board versions including 100513573 REV A, REV B, REV D, 100513572, 100513569, 100513567 and 100535074. Each PCB is fully tested to ensure stable performance for hard drive repair and data recovery. Please note that the original 8-pin BIOS chip must be transferred from your faulty board to ensure normal drive recognition and operation. Suitable for professional repair technicians and DIY hard drive recovery.