Summary: This blog helps you repair your APFS or HFS partition on Mac SSD or hard drive. Repair Damaged APFS or HFS Partition by Using Disk Utility 2. Recover Failing or Irreparable Partition Data by Using Software Download the free-to-try data recovery software for Mac to rescue APFS or HFS partition data.
- HFS Plus is an improved version of HFS, supporting much larger files (block addresses are 32-bit length instead of 16-bit) and using Unicode (instead of Mac OS Roman or any of several other character sets) for naming items.
- HFS Plus is an improved version of HFS (Hierarchical File System), which supports much larger files (block addresses are 32-bit length instead of 16-bit).It uses a full 32-bit allocation mapping table. Mac OS Extended format is a hard disk format that increases the number of allocation blocks on the disk.
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HFS+ or HFS Plus is a file system developed by Apple Computer Inc. to replace their Hierarchical File System (HFS) as the primary file system used in Macintosh computers (or other systems running Mac OS). It is also one of the formats used by the iPod music player. HFS+ is also referred to as Mac OS Extended Volume Hard Drive Format, where its predecessor, HFS, is also referred to as Mac OS Standard.
HFS+ is an improved version of HFS, supporting much larger files (block addresses are 32-bit length instead of 16-bit) and using Unicode (instead of Mac OS Roman or any of several other character sets) for naming the items (files, folders) - names which are also character encoded in UTF-16 and normalized to a form very nearly the same as Unicode Normalization Form D (NFD) (which means that precomposed characters like é are decomposed in the HFS+ filename and therefore count as two characters and UTF-16 implies that characters from outside the Basic Multilingual Plane - often seldom used and characters from ancient writing systems - also count as two characters in an HFS+ filename). HFS Plus permits filenames up to 255 UTF-16 characters in length, and n-forked files similar to NTFS, though until recently, almost no software takes advantage of forks other than the data fork and resource fork. HFS+ also uses a full 32-bit allocation mapping table, rather than HFS’s 16 bits. This was a serious limitation of HFS, meaning that no disk could support more than 65,536 allocation blocks under HFS. When disks were small, this was of little consequence, but as larger-capacity drives became available, it meant that the smallest amount of space that any file could occupy (a single allocation block) became excessively large, wasting significant amounts of space. For example, on a 1 GB disk, the allocation block size under HFS is 16 KB, so even a 1 byte file would take up 16 KB of disk space.
How do I know a hard disk is HFS+ format?Select the hard disk in the Finder and choose the Get Info command in the File menu. The format information will specify either Mac OS Standard (hfs) or Mac OS Extended (hfs+).
What are the differences between HFS+ format and HFS format?The most visible difference between HFS+ format and HFS format, other than the minimum file size, is the maximum number of files.
An HFS+ volume contains five special files:
- Catalog file - Describes the folder and file hierarchy of the volume. It is organized as a 'balanced tree' for fast and efficient searches
- Allocation file - Specifies whether an allocation block is free (similar to $Bitmap in NTFS). This is stored in a bitmap, specifying a free allocation block with a 'clear bit'
- Attributes file - Contains attribute information regarding files or folders
- Extents overflow file - Additional extents (contiguous allocation blocks allocated to forks) are stored in a b-tree in this file
- Startup file - Allows computers to boot that do have built in support for HFS+ file systems
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Summary:This article shows you two risk-free ways to revert/convert APFS to HFS/HFS+.And if unfortunately you lose data after changing APFS to HFS/HFS+, don't feel panicked, just downloadiBoysoft Data Recovery for Mac to recover files with ease.
I'm deciding to install MacOS High Sierra on my Mac this autumn. So, if I find APFS not useful, is it possible to convert APFS back to HFS+ via terminal or using Disk utility?
Hfs Plus For Mac Os
If you upgrade to macOS Catalina 10.15, Mojave 10.14 or High Sierra 10.13, the solid-state drive (SSD) will be automatically converted from HFS/HFS+ to APFS and there is no opt-out. However, even though the APFS file system is optimized for HFS+ with many advanced properties, many Mac users cannot get used to APFS and want to convert APFS back to HFS+. It is undeniable that APFS does come with some limitations and brings users troubles like drive corruption after converting from HFS+ to APFS.
Then you may ask, is it possible to convert/revert APFS back to HFS/HFS+? The answer is 'Yes' but with some precautions. This page will list what you should know when you revert or convert APFS to HFS/HFS+ and provide the details about the best APFS to HFS converter with no risk of losing data.
- Table of contents
- 1. Notes on converting APFS to HFS/HFS+
- 2. How to revert/convert APFS to HFS+
- 3. How to recover lost data after reverting/converting APFS to HFS+?
- 4. Conclusion
Notes on converting APFS to HFS/HFS+
Hfs Plus For Macbook Air
First, as you may have noticed, there is a new concept called container in APFS. A container is the basic storage unit for APFS and each APFS container contains one or more APFS volumes. One of these APFS volumes will have macOS and each volume could have different APFS type: APFS, APFS (Encrypted), APFS (Case-sensitive) or APFS (Case-sensitive, Encrypted). As a result, there are some rules when you convert APFS to HFS/HFS+:
Allowed: convert APFS container to HFS+ (also named Mac OS Extended)
Not allowed: convert a single APFS volume to HFS+
Not allowed: convert APFS to HFS
What's more, you need to know that converting APFS back to HFS+/HFS will format your SSD and erase all data on it. Thus, please make sure you have a backup copy of the APFS container or the whole drive. If you already backed up your data on this SSD drive, read Part 1 to learn details about how to convert/revert APFS back to HFS. Nevertheless, if you have lost something important when you convert APFS to HFS+, you can skip to Part 2 to recover lost data after the conversion from APFS to HFS+.
How to revert/convert APFS to HFS+?
Method 1: Convert APFS to HFS+ in Disk Utility
Disk Utility is a built-in tool that can manage internal and external storage devices, including partitioning and formatting your disks, creating disk image, checking and repair disk errors, etc. So, you can convert APFS to Mac OS Extended (HFS+) with this natural APFS to HFS+ converter - Disk Utility.
Attention: This process is destructive to your data on the APFS container/drive. So please check again if you have a backup copy.
Vpn express for mac. Step 1: Go to Applications > Utilities > Disk Utility.
Step 2: Select the drive that you want to convert/revert from APFS to HFS+.
Step 3: Click Erase on the top of the Disk Utility window.
Step 4: Complete the required name, select Mac OS Extended (HFS+) as the new format and then click the Erase button.
When the process finishes, you'll get a clean HFS+ formatted drive and you can then copy back your data.
Method 2: Convert APFS to HFS+ with Terminal
The Command line, or known as Terminal in macOS, is a powerful, text-only method for interacting with your Mac computer. If you are an experienced Mac user, using macOS's built-in command line would be an appealing way to convert/revert APFS to HFS+.
Step 1: Go to Applications > Utilities > Terminal.
Step 2: Type diskutil list and find the identifier of the APFS container.
Step 3: Typediskutil eraseDisk JHFS+ 'the disk name' /dev/'the identifier'. This process will wipe all the files in this APFS container and convert it back to APFS.
How to recover lost data after reverting/converting APFS to HFS+?
Hfs Plus For Macs
If you get into problems during the process of converting APFS to HFS+/HFS, such asHFS+ partition corruption, , or have lost data due to mistaken APFS to HFS+ conversion, you can recover lost data with iBoysoft Data Recovery for Mac.
iBoysoft Data Recovery for Mac is thebest APFS data recovery software that can recover files after failing to convert APFS to HFS+, convert HFS to APFS, recover deleted/lost data from APFS volumes,recover lost data from formatted APFS drives, recover lost data from unmountable APFS drives, recover lost data from inaccessible APFS drives, recover lost data from corrupted APFS drives,recover deleted/lost APFS volumes, etc.
Step 1: Launch iBoysoft Data Recovery for Mac.
Step 2: Choose the drive that you lost files when you converted from APFS to HFS+, click 'Next' to scan for lost files on it.
Hfs Plus Format
Step 3: Double-click to preview the searching results and make sure the data integrity.
Step 4: Choose files you want to get back, click 'Recover' and save them.
Except for APFS data recovery, iBoysoft Data Recovery for Mac also performs effective and reliable data recovery from drives formatted with other file systems (such as HFS, HFS+, FAT32 and exFAT), as well as data recovery from formatted, unreadable, unmountable, corrupted hard drives, external hard drives, memory cards, USB drives, Pen drives, etc. It's fully compatible with macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.
Hfs Plus For Macbook Pro
The newest default APFS for macOS Catalina/Mojave/High Sierra and later is not necessarily the best for Mac users. If you need to downgrade APFS to HFS+/HFS without data loss, backing up your data and reformatting your drive is always the safest choice, while if you are interested in new features in APFS, you may also want to knowhow to convert HFS to APFS on Mac . Just go and check it out!
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