@scsiguy I'll quote @don-brady on the matter,
>Re: disks without a GUID Partition Table (GPT)
Post by dbrady ยป Thu Oct 18, 2012 7:39 pm
>Please note that using disks without a label (ie without a partitioning
>scheme) is a really bad idea. The OS X model of disk discovery (probing) is
>built on the assumption of labeled disks.
>Since each file system has different disk layouts, its possible to
>simultaneously have two different file systems on an unlabeled disk (from a
>probe standpoint). Think about what happens when you create one file system
>then create a different one over the previous one! Unless you intentionally
>wipe out all identifying marks of the first one, it can pass a probe of the
>prior file system. With multiple platforms and file systems out there, I
>wouldn't rely on any single file system creation call to correctly remove the
>prior occupant. Using explicit container typing (i.e. using partitions) helps
>avoid these type of cross file system corruptions. I have seen enough of these
>to know that it's a real problem and it's typically very destructive.
>For ZEVO we recommend only using GPT partitions to hold ZFS content for use
>with OS X.
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