struct BootBlock4

    typedef struct BootBlock {
              byte JumpInstr[3];
              byte OEMinfo[8];
              struct BIOSParmBlock BPB;
              unsigned int SectorsPerTrack;
              unsigned int numberHeads;
              unsigned int numberHiddenSectors;
              unsigned long TotalnumberSectors;
              byte Physicaldrive;
              byte reserved1[1];
              byte Signaturebyte;
              unsigned long VolumeSerialNumber;
              char VolumeLabel[11];
              byte reserved2[8];
         };

    #include <doshk.h>