Here are five quick tips to free up space on a hard drive…
1: Quit & Relaunch Apps
Apps like Safari, Chrome, Firefox, Photoshop, Spotify, and many others, create temporary cache files while they’re in use. If you haven’t quit these apps in a long time, those cache files continue to grow, and generally they aren’t cleared out until the app is quit. You can also delete the cache files manually, but it’s much easier to just relaunch your apps and have the OS clear it for you. It’s a good idea to relaunch apps from time to time for this reason, particularly web browsers.
2: Tackle the Downloads Directory
The user downloads folder is notorious for growing gigantic when left unchecked for a while, and it’s often the easiest pickings. Jump to your ~/Downloads directory and sort by file size, then delete anything (everything) you don’t need any more.
A good future habit to help manage the downloads directory is this: once you install an app, delete the installer .DMG file, zip file, or archive it came from.
3: Reboot the Mac & Install System Updates
Though we rarely reboot our Macs around here, rebooting a Mac will almost always free up a fair amount of disk space, simply because it flushes system caches, some app caches, installs system updates, and perhaps more significantly, the virtual memory swap files and sleep image files. The latter two can grow quite large if you rarely reboot a Mac. Swap files are basically things that are no longer active in memory and then swapped to storage on disk, and the sleepimage file is basically a duplication of what’s in current memory so it can be retrieved when a Mac is woken from sleep. Both of these files will be cleared when a Mac is rebooted, in the example below these two temporary files accounted for 21GB of disk space alone, though this was on a Mac that hadn’t been rebooted in five months.
It’s a good idea to reboot a Mac with some regularity, even if it’s only once a month or so to install the OS X system updates that come out periodically. Speaking of System Updates, if you’ve downloaded them but haven’t installed them yet, they’re just sitting around taking up disk space on your Mac. That can easily end up taking up a couple gigabytes for major system updates, and rebooting will take care of that wasted space and also install the update.
4: Use OmniDiskSweeper to Find Hidden Space Hogs
OmniDiskSweeper is an excellent free utility that will scan your hard drive and list all directories by size, making it extremely easy to quickly determine what is taking up space and where. Use this to identify space hogs after you’ve targeted the easy suspects, like the downloads folder. This is generally better for advanced users, and you should never delete a file you’re uncertain of it’s purpose, and certainly never delete any system files or you may mess up the Mac.
We’ve discussed the free OmniDiskSweeper tool in the past as a great way to recover disk space, and there’s no better time to use it then when you get the dreaded “disk full” warning.
5: Empty the Trash
Sounds obvious, right? It is, but it’s also pretty easy to forget to empty the Trash and let it grow and grow, and sometimes a hard drive can be running out of space simply because a bunch of stuff was moved to the Trash but it wasn’t actually emptied. If you’ve somehow never done this before, right-click on the Trash and choose “Empty Trash”.
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