Second, see this How To outline for creating a bootable El Capitan installer. First, review this introductory article: Create a bootable installer for macOS. Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra. Click on the Erasetab in the Disk Utility toolbar. After Disk Utility loads select the drive (out-dented entry with the mfg.' S ID and size) from the side list. Open Disk Utility in the Utilities' folder. Go to the Partition tab and select '1 Partition' from the dropdown menu. If you want to burn Lion to a USB flash drive, plug it in and click on it in the left-hand sidebar in Disk Utility. Click 'Browse' button to select the DMG file you want to burn. Click 'Burn' button on toolbar or select the 'Tools Burn' Menu. Run PowerISO, and insert a blank or rewritable optical disc in the drive.
