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HFS Plus lacks several features considered staples of modern file systems like ZFS and NTFS.[15] Data checksums are the most routinely cited missing feature.[16] Additionally, the core of the file system uses case-insensitive NFD Unicode strings, which led Linus Torvalds to say that "HFS+ is probably the worst file-system ever."[17]
Besides checksumming, features of modern file systems that HFS+ lacks include:
nanosecond timestamps[16]
concurrent access (that is, more than one process can access the filesystem at the same time)[16]
snapshotting[16]
Support for dates beyond February 6, 2040[18]
sparse file support[16]
a better implementation of hard links (in other filesystems, these are typically multiple directory entries pointing to the same data blocks; hard links in macOS are implemented as small files that are stored in a special hidden directory)[16]
HFS Plus was not designed for Unix-like systems, so features such as file system permissions and hard links had to be retrofitted when Apple moved to Mac OS X. It was also designed when Mac used big-endian processors such as the Motorola 68000 series and PowerPC processors, rather than the little-endian Intel x86 processors used by current Macs, so all file system metadata are stored on disk in big-endian format. As a result, on current Macs, all metadata must be byte-swapped when read into or written from memory.[16]
