This is it, you have a bootable OS X usb drive.

From the first iso, obtained on step 3, copy BaseSystem.chunklist and BaseSystem.dmg on the thumb drive (actually, the latter might not be necessary - but it worked for me at this step and I stopped experimenting). Mount the thumb drive (you might need to apt-get install hfsprogs to mount an HFS filesystem). In my case (High Sierra 10.13.6), 4Gb stick was sufficient, even though createinstallmedia requires 8Gb. Download the macOS El Capitan installer and Disk Creator Insert an 8GB (or larger) flash drive Open Disc Creator and click the Select the OS X Installer. iso as well ( dmg2iso -i BaseSystem.dmg -o BaseSystem.iso)Ĭopy it to a thumb drive: dd if=BaseSystem.iso of=/dev/sdX BS=1M. iso įind BaseSystem.dmg in the mounted image. You can do it from GUI (right click, 'Open with disk image mounter') or something like mount -o loop. Step 2: Visit this page of TransMac and download the latest version of TransMac software on your PC. So, you'll need to find an alternative source.Ĭonvert. Step 1: Connect a USB drive with at least 16 GB of storage space to your Windows PC and move all data from USB drive to a safe place as the drive will be erased while preparing macOS bootable USB. This question on apple support has all the links, but they are only accessible from OS X (if you had access to a live OS X at this point - you probably would've just used createinstallmedia already, right?).

Unlike El Capitan, High Sierra only needs BaseSystem.dmg, which also has enough free space to boot - so, the process overall can be simplified a bit. So, leaving it here in case somebody else will need to.

I recently had to make a High Sierra 10.13.6 bootable USB drive, and the process turned out a bit more involved that just dd-ing the dmg2img-generated ISO to a thumb drive.

Bootable usb mac el capitan