How to quickly determine the Win7 system hard disk boot area error

When we use the win7 mirror system computer, we know that the hard disk is very important hardware for the computer, if our hard disk has problems, then our computer will stop running completely However, when we use the computer on the Internet, we may encounter bad sectors on the hard disk of the computer, or there is a wrong fault in the boot area. So when we encounter such a problem, how can we find out early solutions? The hard disk loss is reduced, take a look at the specific steps of the win7 system to determine the hard disk boot area error.
Phenomenon 1: If the hard disk booting system does not correctly transmit the SYS command when our computer is turned on, it may be that our hard disk has a boot sector fault.
Phenomenon 2: There is also the computer's hard disk can't boot when booting, which means that our system and hard disk don't agree. This situation may be that the data of our hard disk boot sector has been wrong, or it is being Destroyed, the data will not be able to boot after the loss, this is generally a phenomenon after poisoning.
Phenomenon 3: The last one is that the parameters in the BIOS of the win7 computer hard disk are correct. We can't find our hard disk when we enter DOS or Windows system. This is also the phenomenon that our master boot record is damaged. So how do we get ready to minimize data loss when these situations occur on the computer.