howdee - im a new user, but registered for just this one long/detailed comment/reply...
Use Terminal to Create the El Capitan Bootable USB Installer Follow these steps to create a bootable USB installer of El Capitan in Terminal. Connect the USB flash drive to your Mac. Give the flash drive an appropriate name. Image via arstechnica.net Step 4: Drag your USB (or a Dual-Layer DVD) drive from the list on the left into the 'Destination' box and click 'Restore' (or just click the 'Burn' button in the upper left if you're using a Dual-Layer DVD) and in 10-30 minutes (depending on whether you're using USB 2.0 or 3.0) you'll have your backup disk ready to instal on as many Macs as you like. I tried to install Mac OS X Tiger on the newly purchased USB HDD. When I try to run the install from within Leopard, the setup will prompt me with destination hard drive. It doesn't allow me to select the USB drive and says 'It cannot install on external drive because it cannot boot from this volume'. In order to create a bootable USB drive for Mac, you need download Mac OS installer. Open App Store on your Mac and search for the latest macOS version. Remember, App Store will only have the latest version which is macOS Mojave at this point when we write this article. I hate to be a dick but I swear the people who answered this question can't read. Hes not trying to install OS X on a windows computer hes trying to make a bootable USB so he can install a fresh copy of OS X on a mac.
0 - THANK YOU to all who came before on this hint/thread/comment... i am just standing on top of the giants before and adding my little comments for others...
1 - i could not make a windows-keyboard work... in particular, my imac (g5) would 'ask' about it when powering up by having me press the key 'just inside of shift key' on each side... thus, i was never able to make the keyboard-combo work correctly... if you cannot get into open-firmware, then try getting a normal MAC-keyboard...
2 - i was having all sorts of problems trying to get the correct device to use for the 'dir' command... i could see the tree of information, but could never make a working 'devalias' for myself... two clues:
3 - i was finally able to get things working better by doing/trying the following (details removed for hopeful-clarity):
4 - once i got my magic incantation correct, it took prolly an hour to get thru the first-boot - but eventually i got the great happy-mac sound from the other room... hopefully you will be able to too... :)
This USB can be used to install a clean copy of Apple Mac os x tiger 10.4 or to update your existing system to Mac os x tiger 10.4 Installing, Recovering or upgrading your software from a USB is NOT a quick process and can take 30-45 minutes to complete. Please be patient and allow the process plenty of time to finish.
Installation Instructions:Insert the USB in your USB Slot. It should appear on your desktop. Do NOT click on it. Restart your mac. As soon as you hear the startup chime press and hold the option[ALT] key on your keyboard. Choose start from USB symbol
Important Notice: This Apple OS X software is FREE to download from the Apple App store using the App Store program supplied by Apple starting with OS10.6 (Snow Leopard). No charge is being made for the system software itself. The charge is for the new USB Drive the time to pre-install the OS X installer on it, plus post sales support and postage/packaging. This medium is the best option if you want to have a copy of the operating system saved for any future additional installations or recovery of existing installations or if you wish to easily install on several computers. It also allows installation on recent Apple hardware that lacks a DVD drive. You save time and potential Data charges associated with (possibly repeated) downloads of the 4GB+ file.
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