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Open Terminal, which is in the Utilities folder of your Applications folder.Connect the USB flash drive or other volume that you're using for the bootable installer.You will create the bootable installer from this app, not from the disk image or. It installs an app named Install OS X El Capitan into your Applications folder. Inside the disk image is an installer named InstallMacOSX.pkg.Download using Safari, and open the disk image on a Mac that is compatible with OS X El Capitan.

The installer for OS X El Capitan downloads to your Downloads folder as a disk image named InstallMacOSX.dmg.

If you do find the lost files in your Trash, you can recover them by right-clicking on them and pressing the “Put Back” button. It seems obvious, but you would be surprised how many files I personally have recovered by simply checking the Trash. Perhaps the easiest thing you can do to try to recover files from a USB flash drive on Mac is to simply check the Mac Trash. The Best Ways to Recover Files From Flash Drive on Mac Solution #1: Check the Mac’s Trash Can Don’t copy any more files to your flash drive, and in fact, keep it disconnected from your computer except to follow the instructions below. Deleted files can still exist on your flash drive, as long as the space they were taking up isn’t written over by your computer. Before getting started with data recovery methods, it’s important to stress one point - as soon as you find out that you have lost files, stop using your flash drive.
