Seagate ST3500418AS SATA 3.5 PCB - 9SL142-021 (HP34 / 5701 R)

This listing is for the hard drive circuit board (PCB / logic board) ONLY — no hard drive is included. Fits Seagate ST3500418AS drives (9SL142-021, HP34, 5701 R) with SATA 3.5 form factor. Due to our large inventory, the exact PCB you receive may differ slightly from the photo.\n\nThese PCBs are intended for drive repair and data recovery work. Before buying, confirm that a PCB swap will resolve your issue by following our hard drive diagnostics guide, and verify compatibility using the Donor Matching Guide.\n\nImportant: most hard drive PCBs store unique parameters in the onboard ROM ("memory") chip. That ROM data is required for the drive to function correctly and must be transferred to the replacement board. If the ROM chip can be physically moved to the new PCB, a local computer technician can typically perform the transplant.\n\nFor customers spending $60 or more, we provide a complimentary adaptation service: we will either transplant the ROM chip onto the replacement PCB or reprogram the new board with the correct ROM data. If you plan to handle the swap yourself, review our PCB Replacement Guide first.\n\nIf a straightforward PCB replacement does not fix the drive, we also offer a comprehensive PCB Replacement Service to handle more complex cases — see the Adaptation Service page for full details.