cached io和paging io是什么意思？

查了很多资料都没用明确的解释清楚cached io和paging io是什么意思，我的理解是：

paging io就是按页从磁盘读写的IO操作，paging io分cached和non－cached，cached paging io就是把数据从磁盘按页读写后要缓存，non－cached paging io就是把数据从磁盘按页读写后不缓存。

cached io就是有数据读写请求就向cache manager请求，如果cache manager找不到，就发出paging io向磁盘请求，获得数据后缓存。

请大侠指点一下，我的理解对不对？

查了很多资料都没用明确的解释清楚cached io和paging io是什么意思

Suggest reading book "Windows NT File System Internals"

paging io就是按页从磁盘读写的IO操作，paging io分cached和non－cached，cached paging io就是把数据从磁盘按页读写后要缓存，non－cached paging io就是把数据从磁盘按页读写后不缓存。

No, there is no such cached or non-cached paging io. Paging IO is used for paging which is issued by VMM, not CM.

cached io就是有数据读写请求就向cache manager请求
[quote]
I/O Manager issues Cached IO to file system to get data. Whether a cache request generated or not is up to the implementation of a file system. NTFS and FAT do issue cache requests to CM.

[quote]
如果cache manager找不到，就发出paging io向磁盘请求，获得数据后缓存。

CM get data through VMM.


I/O Manager, Cache Manager, Virtual Memory Manager and File System are those kernel components involved to satisfy a single Win32 READ/WRITE API call.  Again, suggest reading the above mentioned book to get basic concepts.