下面的代码来自MSDN

#include <stdio.h>
#include <windows.h>
#include <winioctl.h>BOOL GetDriveGeometry(DISK_GEOMETRY *pdg)
{HANDLE hDevice;               // handle to the drive to be examined BOOL bResult;                 // results flagDWORD junk;                   // discard resultshDevice = CreateFile("\\\\.\\PhysicalDrive0", // drive to open0,       // don't need any access to the driveFILE_SHARE_READ | FILE_SHARE_WRITE,  // share modeNULL,    // default security attributesOPEN_EXISTING,  // disposition0,       // file attributesNULL);   // don't copy any file's attributesif (hDevice == INVALID_HANDLE_VALUE) // we can't open the drive{return (FALSE);}bResult = DeviceIoControl(hDevice,  // device we are queryingIOCTL_DISK_GET_DRIVE_GEOMETRY,  // operation to performNULL, 0,						// no input buffer, so pass zeropdg, sizeof(*pdg),				// output buffer&junk,							// discard count of bytes returned(LPOVERLAPPED) NULL);			// synchronous I/OCloseHandle(hDevice);				// we're done with the handlereturn (bResult);
}int main(int argc, char *argv[])
{DISK_GEOMETRY pdg;					// disk drive geometry structureBOOL bResult;						// generic results flagULONGLONG DiskSize;					// size of the drive, in bytesbResult = GetDriveGeometry (&pdg);if (bResult) {printf("Cylinders = %I64d\n", pdg.Cylinders);							// 柱面printf("Tracks per cylinder = %ld\n", (ULONG) pdg.TracksPerCylinder);	// 磁道/柱面printf("Sectors per track = %ld\n", (ULONG) pdg.SectorsPerTrack);		// 扇区/磁道printf("Bytes per sector = %ld\n", (ULONG) pdg.BytesPerSector);			// Bytes/扇区DiskSize = pdg.Cylinders.QuadPart * (ULONG)pdg.TracksPerCylinder * (ULONG)pdg.SectorsPerTrack * (ULONG)pdg.BytesPerSector;printf("Disk size = %I64d (Bytes) = %I64d (MB)\n", DiskSize, DiskSize / (1024 * 1024));}else {printf ("Attempt to get drive geometry failed. Error %ld.\n", GetLastError ());}return ((int)bResult);
}

运行结果：

Cylinders = 60801
Tracks per cylinder = 255
Sectors per track = 63
Bytes per sector = 512
Disk size = 500105249280 (Bytes) = 476937 (MB)
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