difference between mbr and vbr
I think master boot record resides at sector 0 of the physical disk. THe volume boot record is at the sector 0 of the partition. THere can be more than one partitions on a phyiscal disk and each partition starts with a volume boot record.
There is a utility called WinHexEditor. Using this, you can differentiate between the two. You can open the phsyical disk or a logical drive (C,D etc) and see that the BR of both is different although it shows Zero sector in both cases