100717520 REV B PCB Board HDD Logic Controller For ST3000DM001 ST2000DM001 Specifications: Insulating Material: Organic Resin Board Number: 100717520 REVB Most HDD boards have a unique BIOS (ROM or NVRAM chip) that contains specific data required to access the HDD system area. If the BIOS information is not compatible with your HDD, the drive will not be able to read data. Therefore, when replacing the PCB, it is essential to transfer the original BIOS chip to the new board. BIOS chip replacement is required for proper functionality. Please Note: Replacing the PCB can only resolve issues caused by PCB failure. Hard drive failures are not always due to PCB faults. This PCB is not guaranteed to fix your hard drive. Attention: This item is not recommended for individuals without basic knowledge of hard drives, proper tools (such as a hot-air gun), or technical skills. If you are unable to perform BIOS chip transfer, please consult a professional electronics repair service. We are only responsible for providing a fully functional PCB. Package Included: 1 x Hard Drive PCB Note: - Product details may vary slightly due to different manufacturing batches. Please consider this before purchasing. - Due to variations in display settings and lighting conditions, the actual color of the item may differ from the image shown. Thank you for your understanding.