Unable to perform WriteFile() in USB sector

#include <windows.h>
#include <stdio.h>
#include <iostream>
using namespace std;
short ReadSect
       (const char *_dsk,    // disk to access
       char *&_buff,         // buffer where sector will be stored
       unsigned int _nsect   // sector number, starting with 0
       )
{
DWORD dwRead;   
HANDLE hDisk=CreateFile(_dsk,GENERIC_READ,0,0,OPEN_EXISTING,0,0);
if(hDisk==INVALID_HANDLE_VALUE) // this may happen if another program is already reading from disk
  {  
     CloseHandle(hDisk);
	 printf("Read  fail\n");
     return 1;
  }
SetFilePointer(hDisk,_nsect*512,0,FILE_BEGIN); // which sector to read
for (int f=0;f<512;f++)
printf("%c" ,_buff[0]);
printf("\n");

ReadFile(hDisk,_buff,512,&dwRead,0);  // read sector
CloseHandle(hDisk);
return 0;
}
short WriteSect
       (const char *_tdsk,    // disk to access
       char *&_buff,  // buffer where sector will be stored
       unsigned int _nsect   // sector number, starting with 0
       )
{
DWORD dwWrite;

HANDLE tDisk=CreateFile(_tdsk,GENERIC_WRITE,0,0,OPEN_EXISTING,0,0);
if(tDisk==INVALID_HANDLE_VALUE) // this may happen if another program is already reading from disk
  {  printf("write fail\n");
 GetLastError();

     CloseHandle(tDisk);
     return 1;
  }
SetFilePointer(tDisk,_nsect*512,0,FILE_BEGIN); // which sector to read
printf("%x\n",_buff[0]);

WriteFile(tDisk,_buff,512,&dwWrite,0);  // read sector
CloseHandle(tDisk);
printf("HURRRRRRRRRRRRReyyyyyyyy!!!!!!!!!\n");
return 0;
}

int main()
{
char * drv="\\\\.\\C:"; 
char *dsk="\\\\.\\PhysicalDrive2";
char *tdsk="\\\\.\\PhysicalDrive1";
int sector=5;




char *buffer=new char[512];

ReadSect(dsk,buffer,sector);
WriteSect(tdsk,buffer,sector);
printf("%d",sector);




getchar();

}