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This is a special circuit board for Western Digital hard disk drives, matching board numbers 0A90601, 004-0A90601, 001-0A90601 and 0J49793. It is used to replace burned, damaged or malfunctioning original HDD PCB to restore normal reading and writing function. Each board is fully tested to ensure reliable data transmission. It is widely used in hard drive repair and data recovery work. Please note that the original BIOS chip needs to be transferred from the old board to the new one for proper matching and use.