The installesd.dmg file is a disk image file used for installing Mac OS X Lion (10.7) on a Mac computer. This file contains the installation package necessary for upgrading or installing OS X Lion. It is essentially a compressed file that, when mounted, provides access to the installation files needed to perform a clean install or upgrade of the operating system.
If you manage to obtain the installesd.dmg or a similar installer package, you can create a bootable USB drive with it. However, if you only have access to a newer version of macOS, you might need to use different commands to create a bootable installer. mac lion os x 10.7 - installesd.dmg download
Here's an example command for creating a bootable installer on a newer macOS (if you have the original Lion installer): The installesd
sudo /Applications/Install\ OS\ X\ Lion.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Lion.app
Replace /Volumes/MyVolume with the path to your USB drive. Replace /Volumes/MyVolume with the path to your USB drive
When you download an older operating system like Lion from the Mac App Store, it doesn't arrive as a typical application. Instead, it downloads as a hidden package. Inside that package lies the InstallESD.dmg (Disk Image).
Think of this file as the modern equivalent of an installation DVD. It contains the bootable operating system image required to install OS X on a Mac’s hard drive. Without this specific file, creating a bootable USB drive for a clean install is impossible.