Mac os extended journaled9/13/2023 ![]() ![]() exFAT is also vulnerable to file corruption and doesn't have support for metadata like HFS+. The maximum volume size and file size of exFAT is 128 PB, which is smaller than HFS+. NTFSĮxFAT (Extended File Allocation Table), developed by Microsoft in 2006, is the best cross-platform file system that can be read or written by macOS and Windows. If a system crash and the file system becomes unreadable, the journaling log can help locate files on the drive.ĭespite all of its benefits, HFS+ is criticized for the lack of standard features to other file systems such as checksums, snapshotting, and nanosecond timestamp. Better data securityĪpple added the journaling feature to HFS+ to improve data reliability in Mac OS X 10.2.2, which soon became the default in Mac OS X 10.3. HFS+ employs UTF-16 to encode files and folders and permits file names up to 255 characters, making it easier to have a descriptive name. Maximum size of a file and a volume: 8 EB Internationally friendly file names Maximum number of files in a volume: 2.1 billion This allows more allocation blocks and a smaller block size, which means less space is wasted. HFS+ uses a 32-bit value to address allocation blocks, two times larger than its predecessor HFS (stands for Hierarchical File System). Features of HFS+ Better use of Disk Space Without file systems like HFS+, saving a file to a drive is like throwing a rock into the sea, impossible to be found. It creates a directory that expands as files are added to the drive and records metadata and file names. HFS+ is a file system that is significant for making full use of a storage device and how data is retrieved and saved. ![]() Startup File: For booting of non-Mac computers What is HFS+ used for? It stores the first eight extents of each fork.Īttributes File: B-tree with information of additional fork.Įxtents Overflow File: B-tree for the rest of the extents that catalog file doesn't store. Volume Header: Store information about the volume, such as creation time and the number of files.Īllocation File (bitmap): Track if an allocation block is used or free.Ĭatalog File: B-tree that describes the folder and file structure on a volume. HFS+ uses six main interrelated structures to manage data on the volume. Now you can see the file system listed under your drive name on the pop-up window. Click View > Show All Devices, then select your drive from the left panel. On your Mac, click Launchpad > Other folder, then choose the Disk Utility app. To find out if your file system is HFS+ or APFS: You can't read or write to a Mac-formatted external hard drive on a Windows PC because your Mac drive is usually formatted with HFS+ or APFS, which is incompatible with Windows. All Mac operating systems since Mac OS 8.1 (read & write support). ![]()
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