I am afraid I was not able to convey the problem I see behind my question: if . as stated by Gail, minimal logging records allcation changes by a minimally logged statement, it would not be possible to reconstruct data this statement puts into already existing allocation units. So I suppose it should read "allocation units affected by the statement".
But if you read the piece I quoted from BoL, Minimal logging requires that the table is empty or a heap. So only new extents (not allocation units) are affected by a minimally logged insert.
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