Much to the dismay of those Macheads who've started hitting size limits in Tiger's HFS+ file system (all ten of you), Apple has confirmed to InformationWeek that Leopard will not in fact adopt the more capacious ZFS alternative as promised last week by Sun CEO Jonathan Schwartz. Senior director of product marketing for the Mac OS Brian Croll told IW point blank that "ZFS is not happening," contradicting Schwartz's assertion that his company's 128-bit file system would be bringing goodies like built-in data integrity and virtual storage to the iMac and friends. Meanwhile, Sun had no comment on the matter. Of course for most users creating an average Word or Photoshop document, this reversal really doesn't mean much, and may in fact be beneficial when we consider the higher processing demands made by the so-called 'Zettabyte File System." For changes in Leopard that are actually, like, real, you can check out our roundup of the new features right here.