Apple HFS, HFS+, HFSX

HFS Plus is an improved version of HFS, supporting much larger files.

HFS+ was introduced with the January 19, 1998 release of Mac OS 8.1.

Mac OS 10.3 also introduced another version of HFS Plus called HFSX.

HFSX volumes are almost identical to HFS Plus volumes, except that they are never surrounded by the HFS Wrapper that is typical of HFS Plus volumes and they optionally support case sensitivity for file and folder names.