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1. #Difference between hfs file system osx journaled full
2. #Difference between hfs file system osx journaled free

The date values do not account for leap seconds. The maximum representable date is Februat 06:28:15 UTC (GMT). This is slightly different from HFS where the date and time value are stored using the local time. In HFS+ date and time values are stored in an unsigned 32-bit integer containing the number of seconds since Januat 00:00:00 (midnight) UTC (GMT). According to Apple, "The purpose of the journal is to ensure that when a group of related changes are being made, that either all of those changes are actually made, or none of them are made." Date and time values HFS+ also implements journaling, which allows fast recovery in the case of a crash or power outage. These file entries do not appear to have a corresponding entry in the catalog file.

#Difference between hfs file system osx journaled full

Note that these file entries are not full fledged files, like for example on other file systems like NTFS. The first 16 catalog node identifiers (CNIDs) are reserved for special file system metadata file entries. Startup file - Allows computers to boot that do have built in support for HFS+ file systems (introduced in HFS+)

#Difference between hfs file system osx journaled free

This is stored in a bitmap, specifying a free allocation block with a "clear bit" (introduced in HFS+) Extents overflow file - Additional extents (contiguous allocation blocks allocated to forks) are stored in a b-tree in this fileĪllocation file - Specifies whether an allocation block is free (similar to $Bitmap in NTFS).It is organized as a "balanced tree" for fast and efficient searches Obvious user benefit, especially for multimediaĪn HFS volume contains multiple special file entries:Ĭatalog file - Describes the folder and file hierarchy of the volume. The much longer file names, and larger catalog records (because of Maintains efficiency in the face of the otherĬhanges. May help non-Mac OS systems to boot from HFS Support for fixed size attributes (FileInfo andįuture systems may use metadata for a richer Volumes, and a larger number of files per volume.Īllows for international-friendly file names, Radical decrease in disk space used on large There are structurally many differences between HFS and HFS+, which are listed below (Also see: Technical Note TN1150).