I came to know the following. PC startup comes in the following order.
1. POST- Power on self test- Press tab to see the details. This takes care of all the basic things- including basic hardware in place.
2. Booting Preocess: Boot sector keeps all the details of booting. If more than one OS is present then, dual booting will also keep such information in boot sector. It keeps the address of the operating system. This is most imp part of Hard disk. All sector can be repaied or set aside if got damaged, but if boot sector is damaged, HDD can not be used for booting anymore. Data however, can still be recoved from the HDD.
Any embedded technology like HCL EC2. Have to find out if RAID controller acts at this place.
OS loads in memory and computer starts.
If boot sector gets damaged (not physically), may be because of some virus etc, you have the following options:
1. Re-install OS from scratch, format or may not format the C drive. All data will be lost of C drive. Other drive data will remain intact. C drive format is advisable if you are going for OS reinstall. This process overwrites boot sector as well.
2. However, option1 is not advisable to try at first. If you have OS recovery CD(usually comes when you buy a new PC), you can boot from the disc and repair the damage. Please note if the repair option is not coming, your disk may be OS reinstall disk but not the recovery disk. OS disk and recovery disk are different.
Choose Startup Repair
BOOTMGR(MBR) are the same.
When I got rid of damaged BOOTMGR, and my PC started, my HCL EC2 automatically got un-installed. This means, it also wrote something in boot sector.
Also after that, I turned on boot sector virus protection as ENABLED in the BIOS. This will protect any changes being done in boot sector. I also think, this will not let you do any further change like- dual boot, any RAID etc, because it will change the boot sector.
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