benefits of read-only filegroups

http://blogs.msdn.com/sqlserverstorageengine/archive/2007/01/08/read-only-filegroups-and-locking.aspx

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Back to read-only filegroups. They provide you the following three benefits:

Can be compressed (using NTFS compression)
During recovery you don’t need to apply logs to recover a read-only file group
Protection of data from accidental modifications
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