Is journaling enabled for the system partition?
Answers to three questions show that both HFS slices of the disk are HFSX:
- What is the file system on iPhone? (2011-10-12)
- What filesystem does iOS use? (2013-02-27)
- What file systems does Apple use in iPhones? (2013-11-01).
As Apple sometimes distinguishes between
- JHFS+X (journaled, case sensitive)
– so we can't assume that HFSX is always journaled.
Types of HFS Plus
iOS and iPhone aside for a moment … Apple's hdiutil(1) Mac OS X Manual Page lists four HFS filesystem types for creation purposes:
- HFS+J (JHFS+)
The less commonly used expression JHFSX is probably an informal abbreviation of JHFS+X.