HFS+

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HFS+ is a journaling filesystem designed by Apple to replace the aging HFS format. It is also the filesystem used on all iPod devices. It was introduced on January 19th, 1998 in the Mac OS 8.1 update. In the OSX 10.2.2 update, in November 11th, 2002, Apple added journaling to the HFS+ Filesystem.

Improvements

The filesystem supports much larger block amounts (32 bits), which means that instead of having a maximum of 65,535 files, you can now have 4,294,967,295 (2³²-1) files. The max filesize is now 8 EiB, instead of 2 TiB

Links

Apple's documentation