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However, if you find yourself on a scenario where your device (iMac, MacBook Pro, Air, Mac Pro or Mini) is not responding and you happen to have a Windows 10 device, then you can still be able to make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant. This is why it’s recommended that you make a Mac OS X bootable USB when your Mac is in working conditions.

Go to the Extensionssection and click the green plus icon at the upper right section.If you’re still using a Mac OS X the time will come when your computer won’t boot, or a problem may arise where you can’t take control of the device, and booting from an OS X installation media will be required.

Download the pack from VirtualBox official website.

To install the extension pack, you just need to: If you want to connect a USB2.0 or USB 3.0 drive, this pack is necessary. Then, you need to install VirtualBox Extension Pack, which can help extend VirtualBox functionality. Then, the virtual machine will install Guest Additions automatically. To install the Guest Additions, you just need to run the virtual machine, and click Device > Install Guest Additions… at the top left corner of the virtual machine main window. If this expansion pack is not installed, many functions will be lost.

The VirtualBox Guest Additions are software packages which can be installed inside of supported guest systems to improve their performance and to provide additional integration and communication with the host system.

Install Guest Additions and VirtualBox Extension Pack If not, please refer to this post: Fix USB Flash Drive Not Recognized & Recover Data – How To Do. Read More How to Fix VirtualBox Failed to Attach USB Issueīefore performing the following methods, please make sure the USB works normally in the host PC.