Then you need a working Mac OS ISO or DMG Installation Image. To get started with you require a USB drive with at least 8GB storage (16GB recommended). Reinstalling Mac OS is a time-consuming process and requires a lot of patience that's why recommend doing this process in your free time or weekends. Macbooks or iMacs hardly require reinstallation of their Mac OS, but when they do then it's a fairly difficult process especially if your secondary computer is Windows. How To Make Bootable Pendrive For Mac Os X El Capitan.How To Create Bootable Usb For Os X El Capitan Mac.How To Create Bootable Usb For Os X El Capitan Download.How To Create Bootable Usb For Os X El Capitan 10 11 6.Is the twelfth major of the Mac operating system. In here just follow my steps to create a bootable USB installer for your Mac. As you know that Mac OS EL Capitan is the newest version among Mac. Therefore, you can create bootable USB for your Mac using Transmac on windows 10/7/8/8.1 here you will learn the easiest method of creating bootable USB. When the OS X El Capitan and Unibeast downloaded, open Disk Utility and click Erase then enter a.