Questions tagged [filesystem]

The system used to format and organize files on a disk. This includes directory structure, permissions management, metadata, and more. The current default file system for macOS is APFS (High Sierra and higher) and HFS+ (Sierra or lower).

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69
votes
7answers
60k views

How to set to open folder with enter in finder?

I want to set to open a folder in finder with Enter. I know it's possible to open a folder with ⌘ Command + ↓ Down Arrow but I don't like it and I never use it because it's easier to use the trackpad,...
61
votes
8answers
97k views

File can't be moved by root on OS X

I tried to move a few files to a subfolder on OS X. One refused to move. It said Operation not permitted. I tried again as root: $ sudo mv file subfolder/ mv: rename file to subfolder/file: Operation ...
55
votes
2answers
11k views

Where should I store command line applications?

When I download command line applications they are located in my ~/Downloads/ directory. But I feel this is wrong place to have a command line application located. Where in the Mac OS X filesystem ...
54
votes
6answers
124k views

Mount Ext4 on El Capitan

I recently installed OS X 10.11 on my Mac. I tried to read a SD card with an Ext4 partition which wasn't even shown in Disk Utility, although diskutil did show it as a Linux partition. I can't seem ...
54
votes
6answers
22k views

Can I make a DIY Fusion Drive?

I have a Mac Mini with two drives: a 256GB SSD and a 500GB HDD. From what I've read, the new Fusion Drive does all of it's magic in software, using the Core Storage APIs. Can I get my setup to ...
48
votes
3answers
40k views

How to change path in Finder by entering the path manually?

It seems that by default there is no way to enter a whole path in the Finder, so instead one should traverse through all the tree to get somewhere deep in the filesystem. Is there anyway to overcome ...
41
votes
3answers
36k views

What are the differences between journaling HFS+ and non-journaling HFS+?

I'm about to format an external hard disk drive (HDD). What are the key differences between journaling HFS+ and non-journaling HFS+? Apart from the fact that one has journaling and the other does not,...
38
votes
8answers
88k views

Disable storage of invisible files “._” on my cfs or smb network storage

I use OS X Mavericks and have some company storage drives mounted (using smb or cfs). (smb://username@address.path.toserver.com/directory/data). When I work with files on the drive or copy files to ...
37
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1answer
33k views

OS X El-Capitan - /cores directory taking up a lot of space?

Im using a program called Daisy Disk to see what is taking up space in my Mac and I find that the /cores directory is taking up 77gb. Is that a problem? Can I get rid of it to regain the space?
36
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2answers
41k views

What is standard for OS X filesystem? e.g. /opt/ vs. /usr/

What does and should go into /opt/ and what should/does go into /usr/? My understanding is that /usr/ used to be for user home directories, but since they exist in /Users/ - what is the purpose now? ...
35
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3answers
10k views

Strange case of truly invisible file (?) and undeletable directory on macOS

I'm having issues deleting a directory on my macOS Mojave 10.14.3 system. The filesystem is APFS and these are the symptoms: $ rm -rf strange/ rm: strange/: Directory not empty $ sudo rm -rf ...
34
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2answers
16k views

Excessive “Opening application for the first time” dialogs

I often get the dialog box warning me that I'm opening an application for the first time. But, it isn't the first time. Some of these are applications that I use daily. I seem to be getting more ...
29
votes
3answers
11k views

Linus Torvalds and the OS X Filesystem

Back in 2008, Linus Torvalds famously said in an interview that "OS X in some ways is actually worse than Windows to program for. Their file system is complete and utter crap, which is scary." I've ...
29
votes
1answer
108k views

What is iLifeAssetManagement, and can I delete it?

I have 5 GB of stuff in ~/Library/Application Support/iLifeAssetManagement and I'd like the space back. What is this stuff and how can I reduce its footprint?
27
votes
3answers
74k views

What are the advantages of formatting an external disk as journaled HFS+?

The application Disk Utility /Library/Utilites/Disk Utility.app which is part of the applications that ship with the Mac OS allows to reformat an external disk. Options include: Mac OS Extended (...
27
votes
1answer
11k views

How to browse /usr in an Open File dialog?

I came to the necessity of browsing and picking up a file from /usr while using some programming tools, but I cannot do so because /usr seems to be hidden from Open File dialog. Is there any ...
27
votes
4answers
213k views

Easiest way to browse iPhone filesystem

What method of browsing the root filesystem is least likely to make any modifications to it? Hooking to a pc is an option. Jailbreaking is not an option for this question.
24
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1answer
8k views

Why can macOS have two files with same name?

I found there are two files with same names but one with extended attribute while the other not (Actually I used sed command to do in-place operation with one file before): -rw-r--r-- 1 nanxiao ...
24
votes
5answers
22k views

Cross-Platform File System file sharing between MAC, WINDOWS, LINUX?

I've a laptop with triple boot, Yosemite, Windows 8.1, CentOS 7, and need a partition for sharing files between the 3 os's, i've been using exFAT, as it is supported by OSX & Windows but had some ...
21
votes
4answers
17k views

Keyboard shortcut for launching Apps in Dock

In Windows 7, Win + 1, 2, 3 ... 9 launches the first, second etc App in task bar. Is there a similar keyboard shortcut in OS X in order to launch Apps that are in the Dock?
21
votes
1answer
7k views

Why does OS X require admin privileges to unmount a drive from the terminal using `umount` but not when using Finder?

Anyone can unmount a usb drive from Finder by clicking on the "eject" icon next to it. However, only a user with administrative privileges can unmount a drive from the terminal using umount. Are ...
20
votes
8answers
9k views

Easy way to copy paste file paths on Macs

I am working on some long procedures that will need to reference a lot of file paths of documents located locally and on various external drives and servers. In all cases we are using Apple Macs with ...
20
votes
2answers
2k views

Can someone describe the purpose of OSX root level folders in laymen's terms?

Simple and concise documentation on the OSX folder hierarchy is sparse. I'm looking for a simple description of each - what are the functions of each? /private /var /usr /tmp /etc /bin /sbin /...
16
votes
2answers
67k views

How do I mount Ext4 using OS X Fuse

I installed OS X Fuse on OS X 10.9.4 as outlined in http://osxdaily.com/2014/03/20/mount-ext-linux-file-system-mac/ Unfortunately it does not mount any of my Linux filesystems (on external HD or SD ...
16
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2answers
10k 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 ...
15
votes
3answers
19k views

How can I rename a Logical Volume Group?

I have noticed that while I can safely change the name of the Logical Volume (LM Volume) in /Volumes (currently: Apple SSD), I cannot find a way to change the name of the Logical Volume Group (...
15
votes
4answers
6k views

Is it possible to edit the path and view the folder path in the Finder?

I'm not sure what it is called on the Mac, but when I open my Downloads folder (or any other folder), I'm referring to this file explorer window that shows me my file structure. I know there are ...
14
votes
4answers
25k views

How do I rename a file in git that differs by case only?

In my git (Xcode) project, I committed a filename with improper case. Now I went to try to rename it, but when I commit, I get: fatal: Will not add file alias 'MyProject/MyFile.h' ('MyProject/...
14
votes
4answers
66k views

How to write on FAT32 and NTFS from Mountain Lion? [duplicate]

What is the best free software for OS X Mountain Lion for enabling write support for FAT32 and NTFS?
14
votes
2answers
4k 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 ...
14
votes
2answers
24k views

Can you reinstall OS X on a FileVault 2-encrypted drive?

I've been researching FileVault 2 to make sure that I understand it before I enable it on my Mac. While reading Macworld's Complete guide to FileVault 2 in Lion, I encountered an unexpected caveat (...
13
votes
3answers
11k 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 ...
13
votes
3answers
7k views

Are the OSX Mavericks tags visible from the command line?

For example, suppose I have a directory structure such as /Users /tlehman /Math algebraic_varieties.tex [tagged: Math, Documentation] projective_geometry.pdf [...
12
votes
4answers
14k 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?
12
votes
2answers
15k views

Permanently change mount point of volume?

I'd like to set another user's home folder to use a certain volume on my disk. To that end, I'd like to be able to mount said volume at a specific location, say, at Users/foobar I can do this using ...
12
votes
1answer
9k views

Why doesn't /proc exist in OS X?

What is the reason that /proc does not exist in OS X? I was curious to find file descriptors that a process was using in my Mac. The way I do it in linux is to go in /proc/fd folder of that process. ...
12
votes
3answers
17k 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
11
votes
1answer
3k views

File duplication takes no disk space!

I have a question that's probably not asked too often, because it has little negative impact on the user. I can't find it on The Google anyway. So this question is for the edification of the curious-...
11
votes
5answers
8k views

How many files in a folder is too many? [closed]

Many years ago I vaguely recall that the Finder in Mac OS X would start having problems if a folder contained 2,000 - 3,000 items or more. Apple doc says that the HFS Plus file system has a ...
11
votes
1answer
9k 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?
11
votes
1answer
10k views

What is the technical reason why OS X can't write to NTFS devices?

Mac OS X can't write to a hard drive with the NTFS format. It can, however, read it. Why can't it write to it? My basic understanding is that a file format dictates how is data stored and retrieved ...
10
votes
3answers
37k views

Mount folder as a volume (OSX)

Is it possible to (auto) 'mount' folders as Volumes? I have a large DAS Volume, 'Data', that contains all my data. To make paths shorter and more future proof, I'd like to have Volumes like /...
10
votes
3answers
11k views

What folders should I be backing up? Are there any I should avoid?

I'm in the process of configuring a cloud backup for my OS X machine and am trying decide what folders to back up and whether there are any folders I should avoid. I have complete control, by folder,...
10
votes
1answer
14k views

What will occur if the .DocumentRevisions-V100 folder is deleted?

This post concerns the folder located at the following file path: /.DocumentRevisions-V100 I right-clicked this folder in Finder.app and selected Get Info. After several minutes of waiting, the "...
10
votes
1answer
11k views

How to mount ext4 partition on OS X 10.8.2?

I'm new to OS X, I was using Ubuntu till now. All my data are stored on an external drive formated as ext4 system file. Is there any other way to acces this data than installing Virtual Box? I'm ...
10
votes
5answers
17k views

Why isn't finder finding all files?

I had a Smart Search for my Photo Stream files located at ~/Library/Application Support/iLifeAssetManagement/assets/sub/, searching for JPG and PNG files. I found that not all files were showing up. ...
10
votes
2answers
2k views

Why are the alias so big in filesize in Mountain Lion?

I noticed the alias(es) that I create in Mountain Lion are very big in filesize (for example an alias to a folder is 5.8MB!) Compared to Leopard, they were just about 500KB. Why is this? and is ...
9
votes
5answers
4k views

Why would you choose Alfred over Spotlight?

Mac OS X is already loaded with Apple Spotlight, why use Alfred? What does Alfred bring to the table that Spotlight doesn't?
9
votes
2answers
33k views

Does OS X enforce a maximum filename length or character restriction?

What is the maximum filename character length of files in OS X? Of secondary importance is whether some characters are allowed/disallowed in addition to any overall length restrictions.
9
votes
5answers
4k views

Files wrongly considered as damaged in encfs volume

I am using encfs @1.7.5 and osxfuse @2.6.4 installed via MacPorts 2.2.1 on my MacBook Pro Retina Late 2013 which is running OS X Mavericks 10.9.2. When opening certain files (e.g. xlsx, pdf) in my ...

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