public static extern bool DeviceIoControl(
SafeFileHandle hDevice,
EIOControlCode IoControlCode,
IntPtr InBuffer,
uint nInBufferSize,
ref DISK_GEOMETRY OutBuffer,
uint nOutBufferSize,
out uint pBytesReturned,
IntPtr Overlapped
);
public static extern bool DeviceIoControl( SafeFileHandle hDevice, EIOControlCode IoControlCode, IntPtr InBuffer, uint nInBufferSize, ref DISK_GEOMETRY OutBuffer, uint nOutBufferSize, out uint pBytesReturned, IntPtr Overlapped );
public static ulong GetDiskSize(SafeFileHandle handle) {
uint dummy;
DISK_GEOMETRY diskGeo = new DISK_GEOMETRY();
Win32.DeviceIoControl(handle, EIOControlCode.DiskGetDriveGeometry, IntPtr.Zero, 0,
ref diskGeo, (uint)Marshal.SizeOf(typeof(DISK_GEOMETRY)), out dummy, IntPtr.Zero);
return (ulong)((DISK_GEOMETRY)diskGeo).DiskSize;
}