DosQFSInfo

typedef struct _FSALLOCATE {
    ULONG  idFileSystem;  /* file system ID */
    ULONG  cSectorUnit;   /* number sectors per allocation unit */
    ULONG  cUnit;         /* number of allocation units */
    ULONG  cUnitAvail;    /* available allocation units */
    USHORT cbSector;      /* bytes per sector */
} FSALLOCATE;

typedef struct _FDATE {   /* fdate */
 
  unsigned day   : 5;     /* binary day for directory entry */
  unsigned month : 4;     /* binary month for directory entry */
  unsigned year  : 7;     /* binary year for directory entry */
 
} FDATE;

typedef struct _FTIME {       /* ftime */
 
  unsigned twosecs : 5;   /* binary number of two-second increments */
  unsigned minutes : 6;   /* binary number of minutes */
  unsigned hours   : 5;   /* binary number of hours */
 
} FTIME;

typedef struct _FSINFO {    /* fsinf */
    FDATE fdateCreation;
    FTIME ftimeCreation;
    VOLUMELABEL vol;
} FSINFO;

typedef struct _VOLUMELABEL { /* vol */
    BYTE cch;
    CHAR szVolLabel[12];
} VOLUMELABEL;

#define INCL_DOSFILEMGR

USHORT  rc = DosQFSInfo(DriveNumber, FSInfoLevel, FSInfoBuf, FSInfoBufSize);

USHORT           DriveNumber;   /* Drive number */
USHORT           FSInfoLevel;   /* File system data required */
PBYTE            FSInfoBuf;     /* File system info buffer */
USHORT           FSInfoBufSize; /* File system info buffer size */

USHORT           rc;            /* return code */