The MBR of a disk contains 4 partitions at the byte offset 0x1BE. Each partition is a

struct partition{ // other fields

int start_sector;

int nr_sectors; }

Write C code to open a disk for READ:____________________________

Write C code to read MBR into char buf[512];

Write C code to print the start_sector, nr_sector of the SECOND partition Assume the SECOND partition is an EXTEND partition, which has a local MBR Write C code to read the local MBR into buf[ ]:_____________________