Go to Finder > All My Files > Arrange by size Locate the biggest files on your computer:.Here are some ideas to free up space on your drive: Next, you will need enough disk space available, for example, to create Recovery Partition. Note, that it is recommended that you install OS on a clean drive.

The chart below tells you how much free space is needed. One more argument is that the free space on your disk translates into virtual memory so your apps have “fuel” to operate on. This includes not just space for the OS itself but also space for other applications and your user data. Given your Mac isn’t new and is filled with data, you will probably need enough free space on your Mac. Choose Mac OS Extended (Journaled) as the Format. Select the root drive in the sidebar (the next step won’t work if you only select the volume). It installs an app named Install OS X El Capitan into your Applications folder. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. You can now run the operating system as normal and can use this USB drive to boot up your Mac if your boot drive fails.ĭownload: OS X El Capitan This downloads as a disk image named InstallMacOSX.dmg.

Don’t be surprised by the slowness – it will take considerably longer to boot the operating system of a USB drive than the PCIe SSD installed in modern Macs.

Follow the onscreen instructions to install OS X El Capitan. Reboot by pressing the power button and holding down the ⌥ Option key while it starts up. To do this, shut down the mac you want to install El Capitan onto.

Plug your drive into any eligible Mac to install El Capitan.

From floppies to hard drives, MacDrive can handle almost any disk you toss at it. And in the event that your Mac disks is having a problem, our robust repair feature can fix basic disk issues.

MacDrive also includes powerful features that enable you to create and partition Mac disks direct from your PC.

We’ll be repeatedly referring to these Apple OS versions below, so it’s good to know the basic macOS timeline. Further down we’ll explain where to get one and what problems you may face down the road. Finally, if you want to run a parallel copy of Mac OS X on a virtual machine, you too will need a working installation file of an older Mac OS X.

Also, you may have noticed your Mac’s performance went down right after the last update. To begin with, some of your apps may not be working properly (or simply crash) on newer operating systems. There are many reasons that could point you to this radical decision. So, you’ve decided to download an older version of Mac OS X.

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