A boot sector or boot block represents a part of an HDD, optical disc, or any data storage device that includes machine code which has to be loaded into RAM and executed by the computer’s BIOS.
Commonly, the boot block is the first sector of an HDD, no matter its size (512 or 4096 bytes), or if the partitioning is MBR or GPT.
Its main purpose is to permit the boot process to load an operating system or other programs, that is on the same storage device.
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For any other boot related issues you might encounter, don’t hesitate to visit our Troubleshooting Boot Errors section.