Windowsにおいて、ユーザーモードとカーネルモード間でデータ転送を行う手法.
- Buffered I/O: user-mode Buffer, kernel-mode nonpaged Buffer, then an I/O manager transfers contents between buffers
- Direct I/O: user-mode Buffer, kernel-mode MDL which links to the user-mode buffer, access the buffer through MDL
- Neither Buffered Nor Direct I/O: まだよくわかってない
