unused sectors in HDD

Hey guys I have seen in MBR that the first partition on disk starts on the sector 3F. I tried to read the sectors between first sector and the sector 3F (sector 3F being the boot sector of C:). The contain all NULL/spaces. Does anyone know why is it so. I have seen the same thing on every machine I ran the code on. (Most of the college computers, mine, some of my friends' machines...)
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