For most users, the InstallESD.dmg is a – a beautifully engineered piece of Apple’s installer history. Use it with respect for vintage systems and keep it air-gapped from the modern internet unless absolutely necessary. Appendix: Quick Reference Card | Item | Value | |------|-------| | Full OS Name | OS X Mavericks 10.9.5 (build 13F1911) | | InstallESD.dmg size | ~4.8 GB | | Final release date | August 13, 2014 (10.9.5) | | Supported Macs | Late 2007–mid 2014 (excluding some 2013 Mac Pro) | | Boot method | Legacy USB, DVD, or target disk mode | | Alternative today | OS X El Capitan (10.11) – still has InstallESD.dmg but also createinstallmedia | Need the exact SHA-1 hash or a step-by-step video? Search Apple’s official “Installer disk images for older OS X” support article (HT208052) – updated as of 2025.
1. What is InstallESD.dmg? In the world of Apple operating systems prior to OS X El Capitan (2015), the InstallESD.dmg (Installation File System – Embedded Disk Image) was the core, bootable disk image containing the complete installation payload for macOS.
