an a version 4 sstem not mount filesystems created by a version 5 system?

[stan]

The subject really says it all. What major feature got added that was worth
breaking this?

I _assume_ the oposite is _not_ tur? IE a version 5 system _can_ mount
filesystems created under V4, right?

Oh, and while I'm at it, how does V5 fit into this picture?


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