经典翻译

1.Fast I/O is optional for a file system. For a file system filter driver, it is required if any file system it filters supports fast I/O. Because all of the standard Windows NT/2000/XP file systems support fast I/O, essentially it is required of all filter drivers.
Fast I/O is a mechanism that was introduced into Windows NT in order to optimize the handling of certain I/O operations. In addition, fast I/O routines are also used for a variety of communications channels between the FSD and various kernel components, including the I/O Manager, the File System Runtime Library, and the CIFS File Server. Unfortunately, at the present time Fast I/O is not documented, although future versions of the IFS Kit will include documentation on how the Fast I/O routines are used.
译： 对于文件系统来说,快速I/O是可选的。对于文件系统过滤器驱动程序来说,要求所过滤得任何文件系统都支持快速I/O。因为所有标准的Windows NT/2000/XP文件系统都支持快速I/O，本质上来说，这是所有过滤器驱动程序所要求的。
快速I/O是一种为了优化特定I/O操作的处理而引入到Windows NT中的一种机制。此外，快速I/O例程也被用于FSD和各种内核组件之间的通信通道，包括I/O Manager，文件系统运行库，CIFS文件服务器。不幸的是，目前快速I/O文件还不完备，尽管IFS Kit未来的版本将包含快速I/O例程的应用文献。
【转】 http://www.vckbase.com/document/viewdoc/?id=1602（vc知识库）