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HFS (view source)

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{{Filesystems}}
HFS is one of the older filesystems used by Apple for Mac OS, and has since been superseded with [[HFS+]]. You can get the HFS specifications from [http://developer.apple.com/legacy/mac/library/documentation/mac/Files/Files-99.html Apple]
HFS, or Hierarchical File System, is a Filesystem designed by apple to replace the [[mfs|Macintosh Filesystem]]. It was introduced in September 1985, and continued use until 1998, when it was superseded by [[HFS+]]. In Mac OSX 10.6, apple removed support for writing disks and images, making HFS read only. HFS is better for larger and faster drives, such as a harddrive. It was introduced with the first 20MB Harddrive. It was largely introduced in the Mac system version 3, in January 1986, where the floppy disk drive required HFS. It is identified as 0xAF in the MBR.
 
=Issues=
HFS has a maximum block amount of 65,535 (16 bits), which means that each file must be 1/65535th of the disk. This became a problem as disks grew in size, because smaller files would still take up a large amount of space, thus creating a large amount of wasted hard drive space. The filesystem also has a max file size of 2 GB, although it has a max disk size of 2 TB.
=Links=
[http://developer.apple.com/legacy/mac/library/documentation/mac/Files/Files-99.html HFS Specifications]
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