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Questions tagged [apfs]

A filesystem developed by Apple Inc first introduced in macOS Sierra 10.12 Developer Release and for public use in macOS High Sierra 10.13.

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What's /System/Volumes/Data?

New mac user here (Linux background). I'm running macOS Catalina (Beta5). I've noticed there are 5 volumes in my main disk container. One is mounted at /, that I understand, it's the system, another ...
Dan's user avatar
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36 votes
5 answers
45k views

How to delete all local TimeMachine snapshots

I have automatic backup enabled and local TimeMachine snapshots take a large amount of disk space. This space is listed as purgeable in disk info, but cannot be actually used until the system decides ...
Martin's user avatar
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28 votes
3 answers
41k views

APFS on external drive missing from Disk Utility

When I use Disk Utility app in macOS Mojave to format an external drive, I do not see the new Apple File System (APFS) offered as a choice of format. Does it matter that my external drive is a ...
Basil Bourque's user avatar
26 votes
2 answers
13k views

APFS - how do I enable transparent compression

How do i enable transparent filesystem compression on any APFS volume? Or check if it is already enabled? I am expecting something similiar to NTFS compressed attribute. According to Wiki it should ...
Sidias-Korrado's user avatar
26 votes
4 answers
14k views

Does Time Machine support APFS?

I just updated to macOS High Sierra. What's the best way to use Time Machine under Apple's new APFS file system. Should I use Disk Utility to convert my external Time Machine volume to APFS?
Janosh's user avatar
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24 votes
4 answers
48k views

How can I merge primary APFS partition with other empty APFS partition?

Using the latest Macbook Pro with currently High Sierra 10.13.1, I was using bootcamp for a year, and I decided to get rid of the Bootcamp partition this morning. The Bootcamp utility would not let me ...
Scaraux's user avatar
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24 votes
5 answers
4k views

Can I replace existing duplicate files on macOS APFS filesystems with clones?

When you copy a file on APFS, it doesn't actually duplicate the file blocks, instead it just clones the metadata. This is known as copy on write (COW). That prevents identical files from using any ...
pidge's user avatar
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22 votes
9 answers
11k views

Limit Time Machine size in Big Sur

In setting up a new Time Machine, how can I limit how much disk space Time Machine has access to? I am only interested in answers relevant to Big Sur's change to AFPS for Time Machine. Before 10.13, ...
Unrelated's user avatar
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22 votes
1 answer
2k views

APFS folder encryption?

From the feature list APFS supports per-file encryption. Hence by extension it should be possible to setup an encrypted folder (or at least just the files within that folder) with a password that is ...
adib's user avatar
  • 1,313
20 votes
3 answers
21k views

Can't resize APFS Container: Not enough free space in Container due to APFS limits or tidemarks

When I try to resize my APFS container, I get the following error: Error: -69531: There is not enough free space in the APFS Container for this operation due to APFS limits or APFS tidemarks (perhaps ...
Neil's user avatar
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20 votes
4 answers
23k views

How to prevent auto mounting of a volume in macOS High Sierra?

I am trying to prevent 2 volumes from mounting at startup. I created a new fstab using vifs and added the UUIDs of the volumes I don't want to mount at system startup, but for some reason this does ...
Optimus1509's user avatar
19 votes
2 answers
14k views

Does it make sense to format an external HDD as APFS?

I’m currently on macOS Sierra and will upgrade to macOS High Sierra as soon as it comes out, which means my machine will be using APFS. I also have an external HDD (not SSD) that has quite a few ...
user137369's user avatar
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19 votes
1 answer
15k views

Change APFS Volume to case sensitive

I have a macbook pro with 1TB internal glued flash drive, of which around 600GB are full. I would like to change the volume format from APFS (case insensitive, encrypted) to APFS (case sensitive, ...
Urs's user avatar
  • 487
17 votes
4 answers
33k views

diskutil: get total and available space on macOS using APFS

On macOS High Sierra, with SSD formatted with APFS, I've got: diskutil info -all Device Identifier: disk0 Device Node: /dev/disk0 Whole: Yes Part ...
Javier Castro's user avatar
16 votes
2 answers
15k views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'

Yesterday, I have tried to delete an Ubuntu partition. Since, my Mac (13", MBPro mid-2014) doesn't boot. Now, I boot on Mac OS copy with an USB. i follow different subject of this forum (like this : ...
Nicolas Lorand's user avatar
15 votes
3 answers
12k views

200GB unused, but can't change APFS container size due to minimum requirement

I want to create a partition with a different filesystem but in order to do that I need to resize my APFS container. This container has 292,4 GB used space. Its minimum size is 500,07 GB. This ...
Merlijn Vos's user avatar
15 votes
1 answer
10k views

APFS Encrypted vs APFS + FileVault?

I upgraded the SSD in a Mac Mini and I'm reinstalling Mojave via internet recovery. The disk is completely erased right now, and when creating a new partition it asks me if I want to choose APFS or ...
Chef Tony's user avatar
  • 321
14 votes
5 answers
42k views

Can you update to macOS 10.14 (Mojave) without converting to APFS?

At WWDC 2018 macOS 10.14 or macOS Mojave was disclosed. I am currently on macOS Sierra (10.12) and am looking forward to upgrading to macOS Mojave once its released. I was wondering if it will be ...
user7886229's user avatar
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13 votes
2 answers
47k views

How to remove a container disk and reclaim space with main partition?

I used to have a bootcamp partition but somehow while attempting to remove it its changed into a container disk. (don't know how this happened, I didn't explicitly create a container). diskutil list: ...
Piepants's user avatar
  • 277
13 votes
1 answer
11k views

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

I've got a few USB 3.0 HDDs I use for backup and game storage, all formatted in HFS+. What are the advantages/disadvantages of migrating to APFS on an HDD?
CyberSkull's user avatar
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13 votes
1 answer
3k views

Change the quota size for an APFS volume

I created one APFS Container for the whole of my external hard drive. I created several volumes in that - some with quotas. I have now discovered that one quota is now too small. I used diskutil apfs ...
mmmmmm's user avatar
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13 votes
3 answers
34k views

APFS Errors: fsck can't repair

TL;DR Asked the same question on Apple communities, nothing useful. Find the post here: https://discussions.apple.com/thread/8123614 bash-3.2# fsck_apfs -d -l /dev/disk5 fletcher64_init:58: ...
PJJ's user avatar
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13 votes
2 answers
2k views

How can I tell if a directory has APFS Fast Directory Sizing enabled?

Apple's technical documentation in the Apple File System Guide describes that some directories like /tmp are not good candidates for the fast directory sizing feature. Fast directory sizing works ...
bmike's user avatar
  • 238k
12 votes
4 answers
15k views

What filesystems does iOS use?

I can't find this information documented anywhere. What filesystems do iOS devices use? Did Apple stick with HFS+? Is it different between devices and iOS versions?
MDMarra's user avatar
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12 votes
3 answers
13k views

How to prevent conversion to APFS on High Sierra install

The current understanding seems to indicate that "all SSD" machines will have at least their main/root file system converted to APFS on the install of High Sierra. That means HFS+ is still a viable ...
LаngLаngС's user avatar
  • 8,349
12 votes
2 answers
4k views

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

I'm creating small encrypted disk images (under 10 GB) to be used to secure and transfer data between systems running High Sierra (for now) and Mojave. Are there any technical reasons to prefer HFS+ (...
user11421's user avatar
  • 123
12 votes
3 answers
23k views

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

Using diskutil, or other command line tools, how can I determine which filesystem I'm using? # sw_vers ProductName: Mac OS X ProductVersion: 10.8.5 BuildVersion: 12F45
user287980's user avatar
11 votes
6 answers
11k views

How to use tmutil delete on Big Sur, APFS

I'm using macOS 11 Big Sur and APFS. I sometimes want to remove old backups to save space. I don't want Time Machine taking up the entire external drive. % tmutil listbackups 2020-10-18-001052.backup ...
Rob N's user avatar
  • 1,700
11 votes
2 answers
9k views

Is it possible to manually TRIM the unused blocks (free space) for an existing APFS volume?

When migrating a MacBook from HDD to SSD, I did a block-level copy using dd. I believe for optimal flash lifetime and performance, it would be the best to issue a TRIM for every unused block in the ...
比尔盖子's user avatar
11 votes
2 answers
1k views

APFS decreases space randomly

Since I upgraded to macOS High Sierra, one week ago, I have noticed that each time I wake the computer from sleep, the space left on the drive have decreased by a, somewhat, random amount. I have ...
mberg's user avatar
  • 111
11 votes
1 answer
450 views

Understanding APFS firmlink black magic

I'm slowly coming to terms with the black magic behind the APFS system/data volume split. Today, however, I found an artifact that I just don't understand: files that simultaneously exist and do not. ...
LoftyGoals's user avatar
10 votes
5 answers
37k views

How do you perform a clean install of macOS High Sierra with APFS?

I have macOS High Sierra installed on my MacBook Pro already with the APFS format. However, I would like to know the steps involved to perform a clean installation of macOS High Sierra with the APFS ...
Caleb's user avatar
  • 101
10 votes
3 answers
11k views

Migrate from HFS+ to APFS in-place

Using macOS Sierra, how do I migrate/switch/transition/upgrade the boot volume/partition from HFS+ to APFS in-place? Is this advisable, or perhaps already done by the Sierra installer?
P Varga's user avatar
  • 233
10 votes
1 answer
10k views

Cannot change APFS encryption password

I have a clean install of macOS High Sierra with APFS Encrypted file partition. During install I checked the "decrypt at login" option, but each have a different password. I now want to change my ...
Anael's user avatar
  • 220
10 votes
4 answers
2k views

/dev/disk/by-id on macOS?

Suppose that we are doing some operations on drives using for example diskutil. Usually we use /dev/diskX to indicate which drive we are working on, but the number X could change next time we connect ...
Ma Joad's user avatar
  • 411
10 votes
4 answers
5k views

Is it possible to limit the size of an APFS volume?

My understanding is that with APFS, volumes exist inside containers, and the volumes all grow as much as needed, as long as there is space in the container. But I want to limit the space for the ...
Rob N's user avatar
  • 1,700
9 votes
2 answers
5k views

3rd party SSD with High Sierra

If I install High Sierra on a 3rd party SSD, will the main volume's file system be converted to APFS? The hardware is a Early 2011 13" Macbook Pro with a Crucial M4 SSD.
Batman's user avatar
  • 1,142
9 votes
2 answers
15k views

APFS/High Sierra - `tmutil deletelocalsnapshots` not deleting snapshots

Listing local snapshots yields this > tmutil listlocalsnapshots / com.apple.TimeMachine.2018-01-30-194719 com.apple.TimeMachine.2018-01-30-211627 com.apple.TimeMachine.2018-01-30-224917 com.apple....
Dylanthepiguy's user avatar
9 votes
2 answers
3k views

Create an APFS RAM disk

There are various resources about how to create a RAM disk, but they all deal with HFS+ RAM disks. But how does one create an APFS RAM disk? I tried passing APFS as file system to the diskutil ...
DarkDust's user avatar
  • 3,195
9 votes
6 answers
26k views

Can't resize macOS partition (APFS error code 49187)

I'm unable to shrink my APFS macOS partition in Disk Utility or by using diskutil. When I try with either method, I receive error code 49187. There appears to be no reference for these codes and I can'...
atirit's user avatar
  • 669
9 votes
2 answers
5k views

APFS container over multiple physical disks

I have an encrypted APFS container with several volumes. The container lives on a physical partition (disk0s1), which is followed by more partitions (disk0s2, ...) with no free space in between. I ...
Aayla Secura's user avatar
8 votes
3 answers
28k views

Resize APFS partition in Mojave

I'm attempting to resize a partition that's too small for my needs. Here's the output from diskutil list: ~> diskutil list /dev/disk0 (internal): #: TYPE NAME ...
Adrian's user avatar
  • 113
8 votes
2 answers
8k views

What is the default partition type (case sensitive or insensitive) in Macbook pro 2020 (BigSur)?

I have two questions which I can not find an answer by googling: What is the default or recommended partition type for the latest MacOS (Big Sur)? APFS case sensitive or case insensitive? What is ...
sgon00's user avatar
  • 2,384
8 votes
1 answer
2k views

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

I have a clone of my internal SSD on an HFS+ partition of an external drive. I was wondering if there are issues with using such a disk as a startup disk with High Sierra.
A.G.'s user avatar
  • 706
8 votes
2 answers
875 views

Replacing HDD with SSD; what about non-APFS/APFS?

iMac 27-inch, Late 2013, macOS up-to-date I would like to back up my internal HDD (non-APFS) with Time Machine. Then erase the HDD. Then have the HDD replaced with a new internal SSD. Then restore ...
Řídící's user avatar
8 votes
3 answers
38k views

How to convert macOS Extended Journaled to APFS?

My Macintosh HD is running Sierra from which partition for Mojave was made which doesn’t has APFS option. Installed Mojave 10.14.2 on a MacBook Pro mid 2012 which has HDD and volume formatted in ...
user318524's user avatar
8 votes
2 answers
9k views

I can't convert from HFS+ to APFS an external SSD volume I created for testing

I created an external volume with macOS High Sierra. When I try to convert it to APFS with Disk Utility, the "convert to APFS" is greyed out. I tried unmounting the volume first, then it's not ...
Antonio23249's user avatar
  • 1,863
8 votes
2 answers
22k views

Cannot create Bootcamp partition on High Sierra APFS SSD disk

I am trying to create a Windows Bootcamp partition on High Sierra but when I got to select the target disk it tells me that there is no space left on the macOS container. My SSD has 250 GB free space ...
gyurisc's user avatar
  • 1,559
8 votes
1 answer
3k views

APFS - Is it possible to install 2 macOS versions inside one APFS container?

As you might already now, a single APFS container can have multiple APFS partitions inside. Their advantage is the free space is shared between partitions. Today I decided to try out macOS Mojave ...
user avatar
8 votes
1 answer
1k views

Is it possible to clone directories in APFS?

APFS supposedly features cloning for files and directories I would like to figure out how this works, but I can't find a way to use this feature. The only man page which seems vaguely relevant ...
Hakanai's user avatar
  • 438

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