Disk First Aid is a free software utility made by which organzation, that was bundled with all computers running the classic Mac OS, this tool verifies and repairs a limited number of directory structure problems on any HFS or HFS Plus hard disk or volume?
HFS Plus HFS Plus or HFS+ is a file system developed by Apple Inc. It served as the primary file system of macOS. HFS+ was developed to replace the Hierarchical File System (HFS) as the primary file system used in Macintosh computers (or other systems running the classic Mac OS). It is also one of the formats used by the iPod digital music player. HFS Plus is also referred to as Mac OS Extended or HFS Extended, where its predecessor, HFS, is also referred to as "Mac OS Standard" or "HFS Standard". During development, Apple referred to this file system with the codename "Sequoia". At WWDC 2017, Apple announced macOS High Sierra, in which the default file system of Mac is changed to APFS.
Housekeeping (computing) In computer programming, housekeeping can refer to either a standard entry or exit routine appended to a user-written block of code (such as a subroutine or function, sometimes known as a function prologue and epilogue) at its entry and exit or, alternatively, to any other automated or manual software process whereby a computer is "cleaned up" after usage (e.g. freeing resources such as virtual memory). This might include such activities as removing or archiving logs that the system has made as a result of the users activities, or deletion of temporary files which may otherwise simply take up space. Housekeeping can be described as a necessary chore, required to perform a particular computer's normal activity but not necessarily part of the algorithm. For cleaning up computer disk storage, utility software usually exists for this purpose such as data compression software - to "shrink" files and release disk space and defragmentation programs - to improve disk performance.