// function read data from disk info buffer and return if succeed
void read28(unsigned int lba, char* buffer, unsigned sector_count)
{
   unsigned int offset = 0;
   unsigned int i = 0;

   // prepare the hard disk controller for reading (by specefic protocol - taken from ATA PIO Mode osDev)
   out_byte(ATA_ERR_INFO_PORT, 0x00);
   out_byte(ATA_SECTOR_COUNT_REGISTER_PORT, (unsigned char)sector_count);      // sector count
   out_byte(ATA_LBA_LOW_REGISTER_PORT, (unsigned char)lba);                // Send the low 8 bits of the LBA
   out_byte(ATA_LBA_MID_REGISTER_PORT, (unsigned char)(lba>>8));            // Send the mid 8 bits of the LBA
   out_byte(ATA_LBA_HIGH_REGISTER_PORT, (unsigned char)(lba>>16));          // Send the high 8 bits of the LBA
   out_byte(ATA_DRIVE_REGISTER_PORT, 0xE0 | 0x40 | ((lba>>24) & 0x0F));       // master drive + lba + high lba bits
   out_byte(ATA_COMMAND_REGISTER_PORT, ATA_READ);                         // read command
   
   // for every sector - read into buffer
   while(sector_count--) {
      ata_wait_for_rdy(ATA_REGULAR_STATUS_REGISTER_PORT); // Spun up
        ata_wait_for_drq(ATA_REGULAR_STATUS_REGISTER_PORT); // Ready for transfer
      for(i = 0;i < 256;i++)
      {
         // write data from disk into buffer
         *( (unsigned short *)buffer + offset + i ) = in_word(ATA_DATA_REGISTER_PORT);
      }
      offset += 256;
   }
}

  ata_wait_for_rdy(ATA_REGULAR_STATUS_REGISTER_PORT); // Spun up
  ata_wait_for_drq(ATA_REGULAR_STATUS_REGISTER_PORT); // Ready for transfer

ata_wait_for_rdy(ATA_REGULAR_STATUS_REGISTER_PORT); // Spun up