filesystem compatibility

[Chuck Robey]

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Are there any filesystems which FreeBSD has which offer compatibility to
OpenBSD?  I want to add a OpenBSD partition to my long-existing FreeBSD disk,
make it OpenBSD, but I want to be able to transfer data between FreeBSD &
OpenBSD.  Any filesystem which could do that?  Or, maybe looking at it from the
other way, can OpenBSD read any of our FreeBSD filesystems?  I want to move data
between these two, if at all possible, and they're on the same machine, so nfs
isn't a possibility here.
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