![]() The next thing you’ll want to do is rename the target volume that you wish to turn into a bootable installer drive, in this case an external USB flash drive. 1: Rename the USB Flash Drive to Become the OS X El Capitan Bootable Installer When you’re ready, plug the USB / flash drive into the Mac with the OS X El Capitan installer application on it. Presumably you have already made the USB flash drive into a Mac compatible format with Disk Utility, if not you can follow the directions here to format a drive for Mac OS X compatibility HFS . The OS X El Capitan installer application must be on the Mac and in the /Applications/ folder, download OS X El Capitan here if you haven’t done so yet (yes.An 8GB or larger USB Flash Drive like these, this will be formatted and turn into the OS X El Capitan bootable installer.It allows you to export a Virtualbox Disk Image (VDI) to a raw image that can be written to a USB disk.Before getting started, know the requirements necessary to make a bootable OS X El Capitan installer drive are as follows: The secret sauce is the VBoxManage command. Eject the USB drive, then boot your target system.(Optional) You can also create a \efi\boot directory and place a uefi boot file in there if you need it as well.Copy over the BIOS flashing utilities, RAID flashing utilities, etc.Your machine will mount it as a typical USB drive (Windows/Linux/Mac all behave the same in this regard). Upon successful write, remove then reinsert your USB key.Use a tool like dd, rawwritewin, or imgburn to write the image.img file to a USB key.VDI for the VM and use VBoxManage to export it to raw: VBoxManage clonehd image.vdi image.img –format raw Perform the MSDOS installation or copy the DOS directory from the ISO. Use fdisk to partition the 500MB drive (don’t forget to set it bootable) and then use format c: /s to format the 500MB drive as bootable. Depending on which MSDOS iso you have, you will need to partition and format the C: drive.Attach the MSDOS iso to the VM and boot it.Create a new VM with a 500MB hard drive.iso from the Internet (they’re out there.) Fortunately VirtualBox to the rescue!… wait, what? ![]() ![]() Infortunately FreeDOS wasn’t working, unetbootin had failed me, and I was getting desperate. ![]() To set the scene for this quick hack, I needed an MSDOS bootable USB drive so that I could flash firmware for a FreeNAS box I was building. ![]()
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