APFS does not provide checksums for user data.<ref>[{{Cite web|url=https://arstechnica.com/applegadgets/2016/06/a-zfs-developers-analysis-of-the-good-and-bad-in-apples-new-apfs-file-system/ A ZFS developer’s analysis of the good and bad in Apple’s new APFS file system] {{webarchive|urlarchiveurl=https://web.archive.org/web/20170202044416/https://arstechnica.com/apple/2016/06/a-zfs-developers-analysis-of-the-good-and-bad-in-apples-new-apfs-file-system/|deadurl=y|title=A ZFS developer’s analysis of the good and bad in Apple’s new APFS file system|date=June 26, 2016|archivedate=February 2, 2017|dfwebsite=mdy-allArs Technica}}</ref> It also does not take advantage of byte-addressable [[non-volatile random-access memory]].<ref>{{cite web|url=https://www.zdnet.com/article/why-apples-apfs-wont-last-30-years/|title=Why Apple's APFS won't last 30 years|author=Robin Harris|date=June 24, 2016|website=[[ZDNet]]}}</ref><ref>{{cite web| url=http://dtrace.org/blogs/ahl/2016/06/19/apfs-part1/ | author=Adam Leventhal | title=APFS in Detail: Overview | date=June 19, 2016 | access-date=October 1, 2017 | df=mdy-all}}</ref>
=== Performance on hard disk drives ===
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[[FileVault]] volumes are not converted to APFS as of macOS Big Sur 11.2.1. Instead macOS formats external FileVault drives as CoreStorage Logical Volumes formatted with Mac OS Extended (Journaled). FileVault drives can be optionally encrypted.{{fact|date=February 2021}}
An experimental version of APFS, with some limitations, is available in [[macOS Sierra]] through the command line <code>diskutil</code> utility. Among these limitations, it does not perform [[Unicode normalization]] while HFS+ does,<ref>[http{{Cite web|url=https://mjtsai.com/blog/2017/03/24/apfss-bag-of-bytes-filenames/|title=Michael Tsai - Blog - APFS’s “Bag of Bytes” Filenames]|first=Michael J.|last=Tsai}}</ref> leading to problems with languages other than English.<ref>[{{Cite web|url=https://eclecticlight.co/2017/04/06/apfs-is-currently-unusable-with-most-non-english-languages/ APFS is currently unusable with most non-English languages – The Eclectic Light Company] {{webarchive|urlarchiveurl=https://web.archive.org/web/20170608180050/https://eclecticlight.co/2017/04/06/apfs-is-currently-unusable-with-most-non-english-languages/|deadurl=y|title=APFS is currently unusable with most non-English languages|date=JuneApril 86, 2017|dfarchivedate=mdy-allJune 8, 2017}}</ref> Drives formatted with Sierra’s version of APFS may also not be compatible with future versions of macOS or the final version of APFS, and the Sierra version of APFS cannot be used with [[Time Machine (macOS)|Time Machine]], FileVault volumes, or Fusion Drives.<ref name=":0">{{Cite news|url=http://www.howtogeek.com/272741/how-to-format-a-drive-with-the-apfs-file-system-on-macos-sierra/|title=How to Format a Drive With the APFS File System on macOS Sierra|access-date=October 26, 2016|url-status=live|archive-url=https://web.archive.org/web/20161026171416/http://www.howtogeek.com/272741/how-to-format-a-drive-with-the-apfs-file-system-on-macos-sierra/|archive-date=October 26, 2016|df=mdy-all}}</ref>
