From doing some research it should be /dev/sda (SCSI drive) but mine doesn't display that. How can I find out where it is located?
generally MBR of a drive would be in the physical beginning (first physical sector of the disk ) of the IDE be it HDD or SCSI drive.
the first 446 bytes - is the bootstrap program to boot the operating system
following the program you have validation patterns which has one of the offset for Operating System identification. ( in hex notation )