这个网格文件系统不仅需要存储区块，还要存储元数据信息，像目录、文件名、文件大小、最后修改时间等。
The grid file system needs to not only store chunks, but also metadata information, such as directories, files, file sizes, last modification times and so on.
修改 Persist settings 的影响将反映用户 web 网格布局丢失方面的结果。
The impact of modifying Persist settings will reflect result in the loss of the users web grid layout.
如果将所扩展的模型信息保留在实际的网格模型之外，那么在网格模型内修改的行放到网格之外的数据中时很可能不会如预期的那样。
If you keep your extended model information outside the actual grid's model, the row you modified in the grid model may not be the row you think it is in your data outside the grid.
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