hard disk PCB 100685485 Rev a 100657576 B measured |

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 original pcb's bios when we swap pcb. bios chip swapping is a must. before you purchase, please read: 1) this is just a pcb (printed circuit boards), not the whole hard drive; 2) pcb board number is printed on the board, not on the sticker; 3) these boards are used, not brand new, the circuit board components not falling, the interface did not break. all pcbs have been tested before shipping; 4) it is used for data recovery/repair issues, the pcb board has been tested and in good working condition. there is no refund/exchange policy; 5) hard drive failures are not always caused by pcb failure. we cannot guarantee your drive to be repaired by replacing the hard drive pcb; 6) you should swap the bios chip before you exchange the pcb board, as our guide sticker shown, in order to make the replacement board compatible with your hard drive; 7) it is the buyer's responsibility to know whether the board is adequate for his hard drive model; 8) we do not suggest one who has no professional hard drive technology knowledge, and no tools no skills to buy this board, unless you can find someone to help you to repair the hard drive. we are only responsible for providing fully functional board.