16 votes
Accepted

How to prevent conversion to APFS on High Sierra install

It should work by exiting any High Sierra installer GUI and starting the install from the command line: /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --...
klanomath's user avatar
  • 66.5k
14 votes
Accepted

How to tell if I'm using HFS+ or APFS?

The easiest way is using the diskutil command line as follows: diskutil info / You will see a report which will include something like this for an APFS formatted storage: Volume Name: ...
boris42's user avatar
  • 1,451
12 votes

Why TimeMachine defaults to case sensitive?

A case sensitive file system is guaranteed compatible to store data from another case sensitive and case insensitive file system. Apple chose case sensitivity for Time Machine, so that it can ...
Christian Gut's user avatar
12 votes
Accepted

HFS+ vs APFS: What are the pros/cons of converting HDDs to APFS?

APFS (Apple File System) compared to HFS+ Almost all differences apply to Solid State Drives (SSD) and Hard Disk Drives (HDD) as well, while users of HDDs may not see an improvement in speed. APFS ...
oa-'s user avatar
  • 7,736
12 votes
Accepted

Is there a reason to prefer HFS+ over APFS for disk images in High Sierra and/or Mojave?

Whether you choose APFS or HFS+ for the sparse disk image will matter very little. They are synthetic filesystems and pass through iOPS and data to the underlying filesystem. That will have some ...
bmike's user avatar
  • 236k
10 votes
Accepted

Is it OK to use an HFS+ start disk with High Sierra?

Yes - High Sierra fully supports running / booting from HFS+ since it doesn’t even change any system over to APFS except for Apple SSD based systems. Fusion drives and spinning HDD hard drives all ...
bmike's user avatar
  • 236k
8 votes
Accepted

Can I remove BootCamp HFS+ driver

AFAIK the Apple HFS+ drivers are read-only. You may have installed another read/write driver like Paragon. To remove Apple HFS+ Driver: Browse to C:\Windows\System32\drivers\ Move AppleHFS.sys & ...
klanomath's user avatar
  • 66.5k
7 votes
Accepted

Best file system for USB stick for backup purposes

From Apple KB : Backup disks you can use with Time Machine Formatting a backup disk for use with Time Machine The most common format for a Time Machine backup disk is Mac OS Extended (...
Tetsujin's user avatar
  • 116k
7 votes
Accepted

What filesystems does iOS use?

As of iOS 10.3 (March 2017) - APFS/Apple File System is now the file system being used. Previous to iOS 10.3 HFS+ was being used. APFS will add improved support for solid-state drives and encryption ...
dpollitt's user avatar
  • 397
7 votes
Accepted

Is there a downside on using APFS on a conventional HDD when using macOS 10.13 or later?

Yes there are downsides to HDD formatted APFS instead of HFS+ The newer format is optimized for solid state characteristics. The older format is optimized for HDD characteristics. Unless you are sure ...
bmike's user avatar
  • 236k
6 votes

How do I transparently compress a directory?

The compression is supported by HFS+ file-system out of box, however macOS by default doesn't compress any files. afsctool There is a afsctool command-line utility which can transparently compress ...
kenorb's user avatar
  • 12.7k
6 votes

Change "ignore ownership on this volume" from the command line for Mac OS X volume

I found that both answers worked for enabling ownership in way that is remembered: sudo diskutil enableOwnership <diskname>s<slicenum> And: vsdbutil -a /Volume/<volname> However, ...
Russell Owen's user avatar
6 votes
Accepted

Recommended disk format for external SSD running as system drive for a 2019 iMac

Only APFS is supported for running Catalina. There may be some weird workaround for running Catalina on HFS+, but I don't know of any.
Pedro's user avatar
  • 630
6 votes

Recommended disk format for external SSD running as system drive for a 2019 iMac

Pedro has already correctly answered your question. This answer addresses your statement of improved performance. The internal fusion drive is basically a SATA HDD and a PCIe SDD. While your 1TB ...
David Anderson's user avatar
5 votes

How to force a readonly volume to remount as read-write?

I have to do the following from the command line to get a USB drive to mount read/write: diskutil list sudo diskutil unmount /dev/disk2s1 <- (put your volume/partition in here) cd /Volumes sudo ...
Alan's user avatar
  • 59
5 votes

Can you use an APFS-formatted Mac with a pre-APFS Apple Time Capsule?

Yes, you can use a normal Time Capsule that is not APFS-formatted with APFS-formatted disks. APFS and Time Machine You don't need to change any Time Machine settings to back up APFS-...
oa-'s user avatar
  • 7,736
5 votes
Accepted

Can you use an APFS-formatted Mac with a pre-APFS Apple Time Capsule?

Having an APFS-formatted system backed up to an HFS+ Time Machine/Time Capsule disk is actually the currently intended use case. The current version of Time Machine supports APFS only as a source ...
vykor's user avatar
  • 2,143
5 votes
Accepted

Terminal command to remove custom icon from file (HFS+)

For files with a custom icon, macOS writes the icon data as a resource fork to the file. Use the xattr command in the following form: xattr -d com.apple.ResourceFork /path/to/filename For more ...
user3439894's user avatar
  • 58.7k
5 votes

How do I split Fusion drive on Mojave / APFS?

I did this earlier today on an iMac. Boot to a Mojave USB boot installer. Then Utilities → Terminal. The commands are along the lines of: diskutil apfs list Then make note of the “virtual disk” that ...
shadowmoses's user avatar
5 votes

Is there a reason to prefer HFS+ over APFS for disk images in High Sierra and/or Mojave?

In addition to @bmike's very good answer, some legacy programs expect the directory listing to be pre-sorted as it is in HFS+; this is an uncommon issue but some things (especially ones which ...
fluffy's user avatar
  • 902
5 votes

Minimizing the use of APFS in Mojave by putting Users and Applications on HFS+

Consider that if APFS reports checksum errors, and you reformat and reinstall, and the same thing happens again after a short while - then you could very well have a failing storage medium. Instead ...
jksoegaard's user avatar
  • 77.9k
4 votes

Switch back to HFS+ from APFS

I'm afraid there's no non-destructive way to revert back to HFS once converted. You may use diskutil apfs deleteContainer /dev/disk(x)s(x) (where x is your correct APFS container). This will revert ...
David Baverstock's user avatar
4 votes
Accepted

How does Apple perform a lossless in-place conversion from HFS+ to APFS?

It’s a four step process according to this article from The Ecletic Light Company Read and convert the existing HFS+ metadata (files, directories, etc) to APFS format; writes it to free space on the ...
Allan's user avatar
  • 102k
4 votes

Is it at all possible for Big Sur to be booted from an HFS+ formatted volume?

No. BigSur filesystem is setup to require/rely on features of APFS. Interestingly enough though, bootable Bigsur system installers work formatted as HFS Extended Journaled.
Digitol's user avatar
  • 91
3 votes

Best file system for USB stick for backup purposes

For macOS Big Sur 11.0 and newer Since macOS Big Sur, the best file systems to use for Time Machine backups are APFS and APFS Encrypted, as mentioned in the macOS User Guide: APFS or APFS Encrypted ...
Nicolapps's user avatar
  • 170
3 votes
Accepted

How does iOS change file system format during upgrade to iOS 10.3?

It's long been possible to convert one filesystem to another on the fly - Paragon NTFS-HFS Converter is one of many utilities that can handle the task. Equivalent technology could readily be ...
Tetsujin's user avatar
  • 116k
3 votes

Optimize filesystem for speed over integrity

Going with the default filesystem on a OS X/macOS install The man page for mount on macOS lists only two options that are performance related to hfsplus: - async All I/O to the file system ...
LаngLаngС's user avatar
  • 8,279
3 votes

How to prevent conversion to APFS on High Sierra install

Read here how to do it with ....startosinstall.... https://derflounder.wordpress.com/2017/09/26/using-the-macos-high-sierra-os-installers-startosinstall-tool-to-avoid-apfs-conversion/ an easy solution,...
LexS's user avatar
  • 1,461
3 votes

How to mount /dev/disk1 with write permissions from Recovery Mode?

When started in the Recovery Partition, choose Disk Utility from the list and click Continue. I'm assuming you are using 10.8.5 Mountain Lion. Select Macintosh HD in the list of volumes on the left ...
boris42's user avatar
  • 1,451
3 votes
Accepted

Is it possible to mix APFS and HFS+ volumes on the same physical disk?

Well, you would need a separate partition for each volume type. In other words, APFS type partitions can hold multiple volumes, but each must be a APFS volume. HFS+ type partitions can hold a single ...
David Anderson's user avatar

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