filedisk中的镜像文件为什么不能打开缓存模式？

[jackhatedance]

如果打开缓存模式，copy大文件就死，小文件却没事？

[rendy]

因为它本身也使用文件来模拟的，如果打开缓存模式，就会陷入一个死循环里（它本身也要缓存）。

以下是原代码中的说明：
// The NT cache manager can deadlock if a filesystem that is using the cache
// manager is used in a virtual disk that stores its file on a filesystem
// that is also using the cache manager, this is why we open the file with
// FILE_NO_INTERMEDIATE_BUFFERING above, however if the file is compressed
// or encrypted NT will not honor this request and cache it anyway since it
// need to store the decompressed/unencrypted data somewhere, therefor we put

[rendy]

// an extra check here and don't alow disk images to be compressed/encrypted.