![]() ![]() For most hard disk PCBs, it is easy to find the chip where the firmware are stored (we call it the BIOS chip), all of the 8pins (4 pins on each sides) with 25P05VP、25P10VP、25F512、25F1024、25F1024AN、SST25VF512、SST25VF010, etc. The operation of transfer the PCB firmware is not complicated. Screwdriver (T6/T8, available for purchase when purchasing a PCB).so we have to swap the BIOS from your original board to the replacement board. If PCB firmware is missing or incorrect, there is no access to the hard drive, and no access to user data. We know PCB includes 2 parts: hardware (components) and firmware (data in the bios chip) The firmware includes HDD's unique configuration data to access the hard disk system area. Why transfer the firmware when swapping HDD PCBs ![]() That is because we did not do a very important procedure: firmware transfer. Hard drive PCB firmware transfer (also called hard drive PCB BIOS swap) is a procedure that we must do after purchasing a replacement circuit(controller) board, a simple circuit board replacing will not make a faulty hard drive operational, we usually encounter this situation: after the new board is replaced, the hard disk doesn't spin, the hard disk has no response, or the size of the disk is different when we saw in the windows BIOS screen. ![]()
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