Подскажите как по букве диска программно узнать его физический номер в Windows

Returns the current (default) drive (1=A, 2=B, and so on). There is no error return.

 

1. // crt_getdrive.c
2. // Illustrates drive functions including:
3. //    _getdrive       _chdrive        _getdcwd
4. //
5.  
6. #include <stdio.h>
7. #include <direct.h>
8. #include <stdlib.h>
9. #include <ctype.h>
10.  
11. int main( void )
12. {
13.    int ch, drive, curdrive;
14.    static char path[_MAX_PATH];
15.  
16.    // Save current drive.
17.    curdrive = _getdrive();
18.  
19.    printf( "Available drives are:\n" );
20.  
21.    // If we can switch to the drive, it exists.
22.    for( drive = 1; drive <= 26; drive++ )
23.    {
24.       if( !_chdrive( drive ) )
25.       {
26.          printf( "%c:", drive + 'A' - 1 );
27.          if( _getdcwd( drive, path, _MAX_PATH ) != NULL )
28.             printf( " (Current directory is %s)", path );
29.          putchar( '\n' );
30.       }
31.    }
32.  
33.    // Restore original drive.
34.    _chdrive( curdrive );
35. }

1. Available drives are:
2. A: (Current directory is A:\)
3. C: (Current directory is C:\)
4. E: (Current directory is E:\testdir\bin)
5. F: (Current directory is F:\)
6. G: (Current directory is G:\)