Here is the easiest way to make a bootable USB recovery disk using a USB flash drive, so you can repair and/or restore your Mac OS X operating system if it is ever corrupted.
Will work in El Captain 10.11, Yosemite 10.10, and Mavericks 10.9 see download links below

New Video on how to do it in Mac Os X 10.12 Sierra

I have a MacBook Pro 8.2. Recently I have download Sierra and Yosemite, and am currently running El Capitan. And I created a bootable USB for OS X Yosemite with DiskMaker X 6, in case Sierra goes wrong. But when I try to check the USB, it's not on Startup Disk. I tried the option key on mac boot, but the USB is not there. Looking for a Windows DVD Maker for Mac OS X EL Capitan? Here is the complete introduction to a DVD burner with Windows DVD Maker for Mac OS X 10.11. Download DiskMaker X here. Solution 1: Make OS X El Capitan USB installer via DiskMaker X. Step 1: Run DiskMaker X,choose El Capitan when you are asked which version of OS X you want to make a boot disk. Step 2: Choose Select an Install file Step 3: Locate and selet El Capitan installer in Applications/ Step 4: Click An 8GB USB thumb drive. DiskMaker X (formerly Lion DiskMaker) is an application built with AppleScript that you can use with many versions of OS X/macOS to build a bootable drive from OS X/macOS installer program (the one you download from the App Store).As soon as you launch the application, it tries to find the OS X Install program with Spotlight. Then, it proposes to build a bootable install disk.

Download Diskmaker here

Straight Download here for El Capitan

SD Card Recovery For Mac Computer in MINUTES DISCLAIMER: Use these tips at your own Risk Disclaimer – use these tips and all Mac tips on this channel at your own risk. – mac tips youtube
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To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier. Mustek a3 2400s driver.

If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, it might say that it's not compatible with this device or is too old to be opened on this version of macOS. To confirm compatibility before downloading, check the minimum hardware requirements:

Diskmaker For El Capitan

• macOS Catalina 10.15 hardware requirements
• macOS Mojave 10.14 hardware requirements
• macOS High Sierra 10.13 hardware requirements
• macOS Sierra 10.12 hardware requirements
• OS X El Capitan 10.11 hardware requirements
• OS X Yosemite 10.10 hardware requirements

Download macOS using Safari on your Mac

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

Diskmaker X El Capitan Error

• macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
• macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
• macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

• macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
• OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
• OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard