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 the Mac OS is HFS+

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47
votes
8answers
18k 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 ...
3
votes
4answers
1k views

What techniques for disk, volume and file system management are possible with OS X, but troublesome within Disk Utility?

In the past, Disk Utility was the best starting point for the vast majority of disk-related tasks. As technologies within (or possible with) OS X have developed – without equal development of Disk ...
13
votes
2answers
13k 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 that exists in /Users/ - what is the purpose now? ...
8
votes
2answers
398 views

Why is there a duplicate entry for my TextMate?

I was changing the default program to open .txt files with and I noticed 2 entries for TextMate. Its one of those little things that annoy me. How can I fix it? I didn't see 2 directors of TextMate....
14
votes
8answers
36k 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 ...
13
votes
4answers
3k views

Problem with “Always Open With” in OS X

I want know how can I apply a software to open all my same document, for example I want to open all my PDF document with Skim but when I right click on it> open with > other and choose my desired ...
18
votes
6answers
28k views

Simplest way to prevent iTunes from automatically launching when iPhone/iPad is connected

Everything is stated in the title. When I connect my iPad or iPhone iTunes automatically launches. What is the simplest way to prevent this from happening?
4
votes
5answers
2k views

What programs have trouble with case-sensitive (HFSX) filesystems, and how to fix them?

There are some programs that require a case-sensitive filesystem, and others that require case-insensitive. Even though Apple warns against using case sensitive file systems, in some situations it is ...
1
vote
1answer
11k 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 /...
3
votes
2answers
2k views

How to setup a default program opening an unknown file extension?

I tried to open a file with an extension name of adb in Finder (to be precise, PathFinder). When I clicked the file, vi editor is activated to open the adb file. I didn't do anything with the adb file,...
33
votes
3answers
20k 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,...
31
votes
4answers
23k 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,...
38
votes
2answers
1k 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 ...
23
votes
3answers
10k 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 ...
11
votes
2answers
15k 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 (...
6
votes
6answers
15k views

Is it possible to mount SharePoint as a volume in 10.6?

Background My office uses: Microsoft SharePoint to store and version our documents Microsoft Office, with Microsoft Document Connection to connect to the SharePoint site. Question 1 Can Finder ...
17
votes
1answer
53k 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?
2
votes
3answers
5k views

Automatically launch a program or action when an external drive or disk is connected

I have an external drive. Is it possible to launch a program or perform an action when I connect it or plug it in?
1
vote
5answers
863 views

How can I create an entry in the /Applications folder that runs a command in the terminal?

I would like to have an item in the /Applications folder that will open a new terminal window and run a specific command inside. How can I create this?
11
votes
1answer
4k 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?
4
votes
0answers
162 views

“Open with” in Finder.app gives duplicate entries [duplicate]

Possible Duplicate: How to omit apps from external drives in “Open With” menu? in finder's open with menu are a lot of dups. I am running latest OX X and patches. I googled and found this ...
3
votes
1answer
93 views

Different “free space” indications in Macintosh HD after upgrading to El Capitan

I wanted to know what was the free available space in my internal HD (I actually have a SSD). In Finder, if I trust the Show Info information (right click or cmd+I on Macintosh HD icon in the Finder ...
3
votes
1answer
2k views

How to delete leftover files from aborted migrations?

I recently got a new MacBook Air and used Migration Assistant (henceforth abbreviated as MA) to transfer my stuff from my old MacBook Pro. However, until MA actually worked all the way, I had to abort ...
1
vote
1answer
87 views

How do I format a usb drive on a PC or Mac?

I have a USB drive that was formatted for a Mac and now I want to use it for a PC. How can I do to make it?
7
votes
4answers
45k views

Alternative to Tuxera NTFS and MacFUSE?

Im trying to mount files to an NTFS format drive, I read on the internet that either Tuxera NTFS or MacFuse work for such things. However TuxeraNTFS filled my USB drive with space that should be free ...
10
votes
1answer
1k 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 ...
4
votes
1answer
2k views

How to get Open File selector to show hidden files?

I would like my Open File selector to be showing hidden files. I am not sure if the same Open File module is shared among many applications that use it or each app has its own. The specific app I ...
17
votes
1answer
4k 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 ...
9
votes
3answers
9k views

What filesystem does iOS use?

I can't find this information documented anywhere. What filesystem do iOS devices use? Did Apple stick with HFS+? Is it different between devices and iOS versions?
8
votes
5answers
3k 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 ...
4
votes
3answers
1k views

How to confirm that a file has copied to a new disk without any errors?

I'd like to copy files from one external drive to a network connected drive. I want to make sure that there are no errors. I know of MD5 hash files that I see for large single files that are download ...
2
votes
2answers
816 views

How to make Smart folder like physical folder with the combined contents of two folders

I have an application which looks for its data (*.txt) files in a folder. I have two folders containing text data that I need to keep separate, but it would be useful to have the application see the ...
2
votes
2answers
604 views

Where is the text expansion file located with OS X?

I'd like to give a colleague all of my text expansions without her having to re-enter them on her Mac. I was hoping to locate the file, then simply send her a copy to replace her own. (She doesn't use ...
1
vote
1answer
56 views

Document editing on the ipad

It is not clear to me how the file system in iOS 8 works. Consider e.g. the Dropbox app, when I open a document in another app, what happens? It looks to me as: copy of the file is created file ...
0
votes
2answers
2k views

What causes chmod to not work on an ssh file in OSX?

I am trying to mount private keys from USB stick. OSx does not allow me to change their permissions, why? How can I change them? In other words, how can I add private keys from random USB stick to ssh-...
4
votes
3answers
15k views

Whenever I try to delete a file in Finder I get “Finder wants to make changes. Type your password to allow this.”

I can't figure out why Finder isn't letting me delete files under my home directory without providing my password. Here's a listing of some files on my desktop: ~/Desktop steve 526$ ls -l@ flower* -...
3
votes
1answer
496 views

What is the function(s) of the hidden Debug menu in Disk Utility? [duplicate]

What is the function(s) of the Debug menu and why is it hidden by default?
3
votes
1answer
202 views

What character is this possessive apostrophe: ’

In a recent answer I needed to include a a possessive apostrophe in a path name within Time Machine for a command line operation. I have it saved in a text file, but what the heck is it? I don't see ...
2
votes
2answers
1k views

Run plist command every 5 seconds

I have the following plist file in my User/Library/LaunchAgents folder. It presses the "g" key every 60 seconds. My question is, how can I change this to press the "g" key every 5 seconds? <?...
2
votes
1answer
464 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. ...
1
vote
1answer
84 views

Partition type suddenly FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, drive unmountable

I have two drives inside my MBP, an SSD for the OS and the original HDD for large Data. The HDD has 3 Partitions: My Data (Core Storage volume) 20Gb for Linux 4Gb for Linux Swap Recently I ran ...
1
vote
2answers
253 views

How to get file metadata?

How to get extensive filesystem information about a file? I have a file that consistently causes errors in my backup utility (Unison). I'm trying to narrow down a bug and find out how it is different ...
1
vote
1answer
3k views

I want to install Adobe CS 6 on an external hard drive but can't select the install location

My SSD is formatted case sensitive, so when I attempted to install I got this: Installation on case sensitive volumes isn't allowed. Please choose a case insensitive location. But I can't select ...
1
vote
1answer
251 views

Difference between du and Finder file sizes

I was having a look at the size of libBLAS.dylib at some location in my Mac and du showed it's file size as 572K while the allocated file size (showed by Finder) was 1.4MB. I've read that the lack of ...
1
vote
2answers
1k views

How many files in a folder is too many?

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 ...
0
votes
1answer
86 views

OSX partitions wiped by NAS RAID

So I messed up when I thought it would be a good idea to stick some hard drives into my NAS. It's now changed the partition table to a RAID0 one and my data has vanished. What are my best chances of ...
0
votes
1answer
107 views

Resizing system partition

When I installed OSX Mavericks, I left free space after my system partition in case I wanted to install a second OS there. This has proved unnecessary — I've never modified the partition table — and ...