1 - Can you tell me what the difference is between these two model numbers please
Western Digital 4 Tb Hard Drive PN:WDBBGB0040HBK-NA
WD My Book Desktop Storage 4TB / PN:WDBFJK0040HBK-04
Or to simplify what does BBGB and BFJK mean?
2 - what is the disk format for each?