char disk[5000]; // The disk is an array of "sectors"
std::string_view partition_table[4]; // Traditional MBR table

partition_table[0] = std::string_view( disk+10, disk+110 );
partition_table[1] = std::string_view( disk+110, disk+2110 );

// Now first partition shows 100 characters disk[10]..disk[109]
// Second partition shows 2000 characters disk[110]..disk[2109]
// Partitions do not affect the data on the disk
// It is an error, if the views are overlapping

// Lets "initialize" the parts of disk shown by partitions:
for ( char& s : partition_table[0] ) s = 'a';
for ( char& s : partition_table[1] ) s = 'b';

// With disks the "initialization" is called "formatting"
// and it writes structures of filesystem into the sectors

// What you can do with "gdisk" is:
partition_table[1] = std::string_view(); // "delete" partition
partition_table[0] = std::string_view( disk+10, disk+2110 ); // modify begin and end

// These do not change the data on sectors disk[10]..disk[2109]

// When OS looks for filesystem, it looks from partition_table[0]
// and finds the one that starts at disk[10]