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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140 views

Saving a filename with a special character in Mac?

I'm using a MacBook Pro with Catalina 10.15.7 and keyboard is set to UK English. I made a folder, mytest on Desktop, and the file test.html with CSS. The character in question is https://www.compart....
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What exactly are the files . and .. on mac?

Anecdotally, files called . and .. seem to often (always?) be present inside otherwise 'empty' directories on macOS. Example Create a new directory (with nothing in it) mkdir test cd into it cd test ...
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36 views

No file descriptor left in emacs

I am using emacs on my mac book pro with Big Sur 11.2.3 And I frequently run into the issue of file descriptors File watching not possible, no file descriptor left: 975 After several hours of ...
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Why does Finder give several different sizes in Get Info?

I'm looking at the size of a folder in get info, and Finder is giving me two different sizes, differing by about 10 GB! I'm curious as to the reason and source of this size difference. In the image ...
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Is there any MacBook-supported filesystem that will not do a scan every time its underlying external HDD gets unplugged without eject?

Currently, with ExFAT filesystem on an external HDD connected to a MacBook Pro I experience very long scan times (proportional to the size of the HDD, several TBs in this case; MacOS is used here) ...
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17 views

Corrupt Photos in Photos_Private.photoslibrary

When I try to open a photo in Photos_Private.photoslibrary, its corrupted. However, if I select Show Package Contents and open the Originals folder, everything is fine. So the question is, where do I ...
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28 views

Messed Up Permissions on Catalina

I am an on-and-off user of Sibelius, and the version I own turns out to be partially incompatible with Big Sur. Some months after upgrading to Big Sur, I decided that I wanted to use my version of ...
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On which Mac OS versions could resource forks and named forks be accessed by “file/rsrc” and “file/..namedfork/myfork” paths?

In all versions of macOS and OS X I have access to from Mountain Lion to Big Sur, I can access the resource fork of any file or directory using the current syntax in the terminal: filename/..namedfork/...
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2answers
407 views

What does it mean to give apps access to Documents folder on Mac?

A lot of apps seem to request access to the Documents folder. Does giving them access mean they can both read/write anything in this folder? Isn't this very dangerous and doesn't that mean we really ...
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1answer
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Drive boots but isn't “located”

The APFS drive I'm writing this text from cannot be located by macOS High Sierra. Everything that needs it misses whatever link is necessary to get to it. I can boot, I can use it, I cannot "find&...
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What filesystem to use for a 10 TB drive connected to router with DD-WRT and Mac?

I am going to connect a hard drive to my router and let the router share the drive through SMB. The purpose is to backup my computers using Time Machine. I realise that if I ever need to restore a ...
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1answer
103 views

Unable to mount read-write in Big Sur 11.2.2 in Single User Mode

I'm on Big Sur 11.2.2, Single User Mode. When I use /sbin/mount -uw /, it says mount_apfs: volume could not be mounted: Permission denied and failed with 66. I have read this post. But mount -uw /...
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How can I force read only access to a hard drive when I connect it to my Macbook Pro?

I am trying to backup some old hard drives, and each time I connect it to my Macbook Pro (Big Sur M1 Silicon), it shows as being modified with today's date on it. I don't know if its spotlight or if ...
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hdiutil fails to create APFS sparseimage: “no mountable file systems”

In macOS Catalina (10.15.7), I'd like to create and mount a sparse, writeable disk image that uses APFS. Specifically, this works if I create Test.sparseimage on my local disk. I'm just unable to ...
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1answer
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A bunch of seemingly random files disappeared from my Mac

Summary: I just discovered that a lot of files were removed from my personal Mac two months ago. There is seemingly no pattern to which files are missing, except that no folders got deleted and only ...
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2answers
192 views

How to make two internal SSD drives work best on a Mac

I have a mid-2010 17" MacPro with two internal 1TB SSD drives, running Catalina. My hope was that I might be able to figure out a way to make them work effectively as one by pointing the "...
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Copy files from iOS to Arduino using dd command?

I'm having an Arduino based MCU which is capable of running compiled .bin files by just copying them onto the device (connected via USB) using the file explorer. After the file was copied (e.g. with ...
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1answer
24 views

Sidebar items disappeared

My finder sidebar items have all disappeared apart from Google Drive, network and my laptop disk... Everything else has gone e.g. desktop, downloads, applications etc etc. I have been into Finder ...
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macOS 11 Finder preserve creation time (file/folder) for iOS 14 devices?

On iOS 14 or iPadOS 14, the Files app allows the user to view the creation time for folders and files, here is a picture of what I mean exactly. Simply press and hold on folders and files and a bar ...
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1answer
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Hidden Python- and R-files: Safe to delete?

I am running macOS Catalina 10.15.7 on a 2020 MacBook Pro. I do a bit of programming in R and Python, and in my home directory I saw a bunch of hidden files: There are files related to ....
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1answer
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std::fstream and OSX - Why can I not load a file with my raw executable?

I have a C++ project in XCode which uses std::fstream to work with a default text file. I haven't specified a relative path so I expect that the file will need to be emplaced in the same directory as ...
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2answers
104 views

Is it a bad idea for a file name to contain space and capital letters?

When naming a file, (for example in OneDrive) is it a bad idea for the name to contain space and capital letters? Is there any potential conflicts it might cause? Should I use hyphen or underscore ...
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macOS Cannot Create Valid Symlink From Terminal Using Relative Paths

Using the following snippet it creates an invalid symlink. But according to other answers it should work fine. # make a temp dir and save path to var. # set dir (mktemp -d) # fish shell only! dir=$(...
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1answer
849 views

How to use sshfs on Apple Silicon (M1)

I'm trying to get sshfs working on Apple Silicon (M1) and am hitting a brick wall. I installed the latest macFUSE already. I also tried building the latest but the instructions on the github pages don'...
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1answer
33 views

How can I show hidden files on 'choose a file' dialog in 3rd-party apps?

I want to choose a file under hidden directories on any application but Finder, but it seems to be not shown. For example, if I put a file called my.terminal under ~/Dropbox/.hidden/, and try to ...
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sudo error: “ No valid sudoers uid 601, should be 0 ” OSX Catalina [duplicate]

Running OSX Catalina on a 2012 Macbook Pro, I recently edited the etc/hosts file and after I did I started having this problem in during my next startup, I somehow lost all use of sudo, anytime I try ...
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1answer
22 views

MacOS Catalina duplicating files on save

I'm a software developer and I constantly need to save files of course. The problem I'm experiencing right now is that intermittently my laptop creates new files of the ones I'm saving/compiling. I'll ...
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0answers
94 views

Installing Kernel Debug kit (KDK) on Big Sur 11.1

I'm trying to install the KDK package on a VM with BigSur 11.1 on it (20C69 build). I used Apple's guide for general guidelines, and this guide for details. It appears that since Catalina, the system ...
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2answers
67 views

Cloning a directory in terminal, using ZSH

I'm trying to clone a directory which holds a git repo. i.e., I have /Users/me/someFolder - someFolder has ALOT of files, like over 250k. It's also a git repo, with a .git directory, and many other ...
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1answer
32 views

Time Machine and work directory

During my daily work, I tend to receive large files (up to a few hundred GB) which are only used for a few hours and then deleted. I am not sure how Time Machine works, but I suppose that every file ...
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1answer
27 views

Opening hidden files with the same application

So I still have the same Macbook Pro since 2013 and she's still running super strong. Over these past 7 years I've managed to accumulate over 30 hidden dot files and folders in my home directory. I ...
2
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1answer
60 views

Is it possible to configure Finder to report hard-links size only once?

I've created multiple hard-links to a file in a folder to illustrate the issue. ~/Test $ ln original.pdf link1.pdf ~/Test $ ln original.pdf link2.pdf ~/Test $ ls -li 403963 .rw-r--r--@ 3 80k username ...
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1answer
41 views

How to open/upload hidden files in apps or webapps?

I can't view .DS_Store, .localized, ._.* and ._* with Finder: Show ALL files starting with a dot in Finder user3439894 commented there that it's impossible to do so with Finder: Some dot files, e.g. ....
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1answer
130 views

macOS: How to read the file system of a disc image

is there terminal command that shows/reads the file system(s) (and versions) of a .iso or .dmg image? E.g. Udf 2.50/Joliet/hfs+
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1answer
43 views

Is it ever possible for a disk/volume to be mounted anywhere other than in /Volumes?

It seems that under macOS that all disks of every type will always be mounted under /Volumes. (Except, of course, for the boot drive which will always be mounted at /.) But is this just the case under ...
0
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1answer
61 views

tmutil doesn't create a real snapshot (since Catalina?)

I'm using rsync on top of a mount_apfs snapshots, to backup a consistent file system view and without having to stop applications during the backup. After having investigated the rsync error 'file has ...
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1answer
27 views

Some files disappear from an APFS snapshot

I'm using rsync on top of a mount_apfs snapshots, to backup a consistent file system view and without having to stop applications during the backup. While so far, it has been working pretty well, from ...
2
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1answer
29 views

Why does /var/vm on MacBook Pro tend to show sleepimage and nothing else?

2020 edition, Catalina 10.15.7 on MacBook Pro. I've looked at /var/vm (not touching anything in there per advice). It used to fill up with 1GB files and they'd be deleted upon reboot, but now it's ...
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0answers
31 views

How do I clean up image thumbnail cache on 10.12 Sierra?

I want to know how to clean up image thumbnail cache on MacOS 10.12 Sierra. Specifically: The system cache (if any) Cache for applications: XnView MP (if any) Gimp (if any) Now I understand none of ...
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0answers
26 views

How can I find out the command line of a process that changed a specific file?

I am trying to find out what process is modifying my /etc/sshd_config file. It happens due to a background process that runs based on periodic intervals or based on a trigger. What I want to see is ...
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1answer
203 views

Is it possible to read F2FS-formatted SSDs in macOS?

The title says it. I have an external drive for use on a Linux system, and would like to read it on macOS (High Sierra). The drive is encrypted (I have the password). Is possible?
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Manually add a program to the File and Folders access list

I've just installed Xournal++ on my MacBook Pro running Big Sur. Most things work fine, but it can't access the Desktop, Documents or Downloads. Usually, programs request permission and one gets a pop-...
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0answers
18 views

Cryptographic hash of resource fork

In macOS, do hashing tools (shasum, crypto libs, openssl, etc), only consider the files' data forks when calculating a digest? Does the resource fork just get ignored? If so can it be included?
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OSXFuse & VeraCrypt on Big Sur: OSXFuse seems to be missing on your machine

OSXFuse and VeraCrypt were both working fine until the MacOS was updated to MacOS 11.0.1 Big Sur. VeraCrypt no longer opens. After installing macFuse 4.0.2 (latest at time of posting), I tried to run ...
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0answers
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Case-insensitive view over a case-sensitive file system?

Steam for macos doesn't work on a case-sensitive file system. A common solution is to create a dedicated virtual image and mount it as a volume. However, because my such image is running out of space, ...
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1answer
69 views

How to delete directory ~/Pictures?

This is on MacOS Catalina, but the same behavior has been observed in prior versions of MacOS. Similar questions have been asked for other default directories in the default home directory, but this ...
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1answer
157 views

Files.app - how to control which app opens when a file is tapped?

iOS 14.1 I'm using iCloud Drive to store files and shuttle things back and forth between my Mac and iPhone. When I tap a file from Files.app on the phone, it immediately opens in a seemingly random ...
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1answer
73 views

Best file system for external hard drive, to be used on both Linux and macOS?

What's the best file system that I can use for an external HD which I want to use on both a macOS system, and a linux system? I can transfer files using sneaker-net much faster than through an AFP or ...
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1answer
121 views

Macbook Pro main volume not accessible - filesystem type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

Preface: I know there are lots of other questions about this on here, but they do not exactly match my situation and/or I do not have the technical knowledge to apply the answers to my situation. ...
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1answer
65 views

When are per-user temp files in /var/folders/ removed?

How often and under what conditions are files under var/folders/ removed? If an application creates a file under var/folders/, is it possible for that file to be removed by the system before the ...

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