>Over the past year or so, I've seen various mentions of HFS with regard 
>to it being a poor way to store data in terms of disk space utilization.
>Please can anyone tell me if that is actually true?

A little late, but:

back when we had Lotus Domino running on z/OS, at one point we converted to ZFS 
and then converted back to HFS. A newly re-organized HFS isn't bad, and they 
said performance was better than via ZFS. This is stressing the 're-organized' 
part. An HFS with lots 'traffic' (delete and allocate of small data sets) over 
time not only gets bad space utilization, it also gets slower.

I cannopt answer you actual space question. At a guess I would say initially it 
is a 1:1 relation, give or a take 5%.

Regards, Barbara Nitz
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