HFS Plus

Hierarchical File System Plus (HFS+), also known as Mac OS Extended, is a journaling file system that was developed by Apple as an update to its aging Hierarchical File System. It was introduced with Mac OS 8.1 in 1998 and remained in use until it was deprecated with the release of the Apple File System with MacOS 10.13 in 2017.

HFS Plus replaced the 16-bit block addresses of HFS with 32-bit addresses, allowing for drive sizes up to 8 exabytes. However, it carried over the 2040 date limit from HFS, which was not remedied until the release of APFS.