Gets disk information using system call 0x36.
#include <dos.h>
#include <errno.h>
unsigned _dos_getdiskfree( unsigned drive, struct _diskfree_t *diskspace );
| drive | Drive number (default is 0) | |
| diskspace | Buffer to hold disk information |
The _dos_getdiskfree routine uses system call 0x36 to obtain information on the disk drive specified by drive. The default drive is 0, drive A is 1, drive B is 2, and so on. Information is returned in the _diskfree_t structure (defined in DOS.H) pointed to by diskspace.
The struct _diskfree_t structure contains the following elements:
| Element | Description |
| unsigned total_clusters | Total clusters on disk |
| unsigned avail_clusters | Available clusters on disk |
| unsigned sectors_per_cluster | Sectors per cluster |
| unsigned bytes_per_sector | Bytes per sector |
If successful, the function returns 0. Otherwise, it returns a nonzero value and sets errno to EINVAL, indicating that an invalid drive was specified.
Standards:None
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:None
/* DGDISKFR.C: This program displays information about the default disk drive.
*/
#include <stdio.h>
#include <dos.h>
void main( void )
{
struct _diskfree_t drive;
/* Get information on default disk drive 0 */
_dos_getdiskfree( 0, &drive );
printf( "total clusters: %d\n", drive.total_clusters );
printf( "available clusters: %d\n", drive.avail_clusters );
printf( "sectors per cluster: %d\n", drive.sectors_per_cluster );
printf( "bytes per sector: %d\n", drive.bytes_per_sector );
}
total clusters: 9013
available clusters: 6030
sectors per cluster: 4
bytes per sector: 512