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My 4 months old Mac partition volume is losing space slowly and gradually. I am pretty sure there are a lot of orphaned temporary files laying around in the volume.

I know where to find the obsoleted temp files in my Windows partition, how about in Mac OS X?

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Man, this comes up for me quite often. Thanks for asking. – Benjamin Oakes Mar 29 '10 at 15:19
up vote 2 down vote accepted

Not sure if this helps but i would try Onyx and Appdelete to get rid of applications, seems to do a decent job of getting rid of extra system files, etc.

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let me give Onyx a try – deddebme Aug 20 '09 at 23:18
Onyx removes many temp/log files and rebuild some system cache folder. Surprisingly it freed a few hundreds megabytes of file, comparing to gigabytes of space in many "rusted" windows installation. – deddebme Aug 21 '09 at 2:13
oh btw, Appdelete is not freeware – deddebme Aug 21 '09 at 2:24

Mac OS X temporary files are stored in /tmp and /private/var/folders. Your specific Cache and Temporary folders can be found by running the command echo $TMPDIR and/or usr/bin/getconf DARWIN_USER_CACHE_DIR

These locations should be automatically cleared out regularly either through the daily, weekly and monthly "cron" scripts and/or a restart so you shouldn't have to worry about it. You can use tools such as Onyx, Cocktail, Leopard Cache Cleaner, etc. to run these scripts and/or clear your caches and temp files.

The one big exception is Safari's Thumbnail cache does not delete and can be found in your DARWIN_USER_CACHE_DIR under

To find out where most of your disk space is going (and if temporary files are even a culprit) I suggest using a program such as OmniDiskSweeper or GrandPerspective to tell you where all the large files are.

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Another couple of possible set of options for checking what is occupying disk space:

Baseline -- unique among disk scanners in that it has a brilliant snapshot function. So it scans your disk and shows you what is occupying space, but it will save this snapshot. A couple of weeks later, run it again and compare to your last snapshot - it will tell you every file that has changed. This is unique and very very useful, especially before/after installing large software suites.

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Daisy Disk -- This is visually the most beautiful of the OS X disk scanners, I always prefer the pie maps visualisation...

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When a backup volume is not mounted, Time Machine has saved hourly snapshots to /Volumes/MobileBackups/ on laptops since 10.7. They are deleted automatically when you start running out of disk space though.

/private/var/folders/ can contain partially downloaded files or files for applications that have been removed. du -sm /private/var/folders/*/*/*/*/ | sort -rn sorts the folders by size.

~/Library/Autosave Information/ can contain old unsaved documents.

~/Library/Caches/ Previews/ was about 700 GB on my installation of 10.7. defaults write DebugSnapshotsUpdatePolicy -int 2 disables saving the thumbnails.

Safari saves the contents of websites and plain text files to ~/Library/Caches/Metadata/Safari/History/.

If hibernatemode is 3, /var/vm/sleepimage takes up the same amount of disk space as the amount of RAM you have.

/Library/Developer/ wasn't removed when I installed Xcode 4.3. It contained about 2GB of old docset files.

A good way to find large files is to sort files by size in list view after checking calculate all sizes in the view options. You can show hidden files with defaults write AppleShowAllFiles -bool true; killall Finder.

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~/Library/Caches/ Previews/ is not more used by recent Safari – furins Jan 10 '14 at 9:53

I use Disk Inventory X to find what actually eats my space. then reveal that files in finder and delete them if they are not in use anymore

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I got a bundled copy of AppZapper with a MacHeist - recommended.

JDiskreport - Free Java Utility will show you where all your space has gone - also recommended

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JDiskreport was useful to browse the disk space allocation. I found some orphans file from GarageBand. – deddebme Aug 21 '09 at 2:08

Most of what I could say is covered above, with a couple exceptions that may or may not apply to your specific case:

If you use Adobe Bridge, the cache folder can get quite amazingly big. I cleaned mine out the other day and ended up removing 8gb of extra space. Also I'm using CS4, and I noticed that my CS3 cache folder was still around even though I got rid of CS3 a while ago. Another 2+ gigs there.

I also use Parallels 4 and it has a nasty tendency to use up all of the free space given enough time, but a computer reboot handles that. This could be just me though. If you do have Parallels or Fusion and have regular snapshots made, that could also be a factor.

I use Whatsize to check what's taking up space, but I got my copy before they started charging. I like it better than the other ones I've seen.

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Reboot your computer. If it suddenly has lots more free space, this is due to the ever-expanding swap files. They are reclaimed (deleted) upon reboot and will eventually get re-created as you use your Mac. This is completely normal.

There's no need for their existence to turn you into a reboot-obsessed user, however. It's a good thing when your Mac swaps unused memory out to disk.

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Just to add a (late) comment, Mac OS X swapfiles do not 'ever-expand' even under normal system use. I regularly see them disappear again, when exiting memory hungry programs (Safari, I'm looking at you...) and have done since the early versions of Mac OS X. – jrg Mar 1 '10 at 12:31

I also cleaned lots of junk files or unneeded files from my system as its getting slower and slower,Tweak and Tuneup helped me in getting back Gb's of space in my mac. I`ll stick with it, as this is the 100% best cleaning app in the market love to have it.

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