Usage Tips:100717520 REV B PCB Board HDD Logic Controller For ST3000DM001 ST2000DM001 Specifications: Insulating Material:Organic Resin Board Number: 100717520 REVB Most HDD boards have the unique BIOS(ROM or NVRAM chip) which includes the unique data to access the HDD system area. If the BIOS information is not compatible with your HDD, there is no way to read the HDD's data. Because of this, we should use the PCB's BIOS when we swap PCB. BIOS CHIP SWAPPING IS A MUST. Please Note: Replacement the PCB only can solve the problem that is caused by the PCB faulty and HDD failures are not always caused by the PCB faulty. This PCB is not guaranteed to fix your HDD. Attention: We do not suggest one who has no basic hard drive knowledge, and no tools(hot-air gun) no skills to buy this board, unless you can find an electronics repair shop help you to change the BIOS. We are only responsible for providing fully functional board. Package Included: 1 x Hard Drive PCB Note: -Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. -Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.