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Check the listing for details. PCB Controller MQ04UBF100 MQ04UBD200 MQ04UBB400 Electronics G0034A. Condition: Used. Listed at 96.62 USD. Thorough diagnosis is required. This data includes information about the read/write heads, firmware version, bad sectors in the hard drive service area, and more. This is done with special tools or by manually transferring the firmware.