Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Searching Google for the following I only found uninformed crap. What is this?

looris@Palace-of-the-Nine-Moons:/tmp $ tree /TheVolumeSettingsFolder/
└── HFSExtentTables
        └── UBNUIHU3QNGCTMAO8ECAQ65960

2 directories, 2 files

The two files are binary data (file just says "data" and strings returns nothing useful).

If they are, as the name would imply, actually "volume settings", how can I know which volume they refer to?

share|improve this question
I couldn't find any definitive documentation, either. The term "HFS extent tables" refers to the data organization scheme of the HFS filesystem, but I don't understand why those would exist as file data instead of metadata. What's the format of your root drive? Do you share the volume over the network? – jmk Feb 2 '13 at 21:12
@jmk format is HFS+ journaled, and only the public folders of each user are shared. – o0'. Feb 3 '13 at 11:01

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.