There is a very simple on line command to create the full Yosemite installer on a USB stick. The command line function is hidden inside the Yosemite installer itself. First, obviously the USB stick needs to be formatted to a single GUID partition with OS X extended, journaled filesystem. You will also need to download the installer app from the Mac App store. Then execute the following command: sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install OS X Yosemite.app -nointeraction /Volumes/Untitled is the path to the USB stick.
Mac users who don’t have access to a bootable Mac machine to prepare the bootable USB of Mac OS X can take the help of a computer running Windows operating system for the job. The only thing is that you must have the DMG file of Mac OS X.
Replace 'Untitled' with the volume name you gave the USB stick. The sudo command will request a password and you must have adminisrator privileges to create. Depending on how fast the USB stick is, it can take a while to complete. This will not only create an installer for OS X but will also have Disk Utility on it as well. I used this to create a USB stick installer to do a full clean install on a 2009 iMac that I was going to repurpose. All worked well. Apple Footer.
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I had a guy bring me in an old Mac Book Pro that had a corrupted hard drive. I saved his Data but then realized his computer was so old that I was going to have trouble getting a copy of OSX installed. His computer was no longer supported on current OSX releases. To make things worse his DVD drive wouldn't read a install disk.
So this post is the result of me finding a way to resurrect an old Mac Book Pro. I hope it will help someone else in a similar situation. Note: Before starting this tutorial, ensure that you have a USB drive with at least 8GB of storage as well as a Leopard, or Snow Leopard retail DVD or disk image. Grey DVDs that were included with a Mac at the time of purchase cannot be used to make USB boot drives as they do not include drivers for Macs other than the computer it was shipped with.
In this tutorial I will be creating a Snow Leopard USB install disk. The steps are the same to create one for Leopard. Format the USB drive. Click the Partition tab. Under the Partition Layout header click on the 1 Partition option in the drop-down menu. Click the Format drop-down menu and select Mac OS Extended (Journaled).
Bear in mind that this will erase all data from the USB drive, so backup any important files before proceeding. To format the USB drive drive, click the Apply button in the lower right-hand corner of the Disk Utility window. Snow Leopard, DVD or Disk Image. Locate a Snow Leopard disk image or DVD on the Mac. If you're using a disk image, mount it to the desktop. In the Disk Utility window, click the Restore tab in the USB drive's menu.
In the center of the window you'll see two boxes: one labeled Source and another Destination. Drag-and-drop the USB drive's partition into the Destination box. Drag-and-drop the Mac OS X Install Drive disk into the Source box. At the bottom right-hand corner of the screen and click the Restore button Disk Utility will restore the OS X Install DVD or disk image to the USB drive; this process may take anywhere from 20 minutes to an hour depending on how quick the Mac is. Using The Snow Leopard USB Drive Now that you've created a Snow Leopard USB drive, let's use it to install OS X Snow Leopard as well as access Terminal, Disk Utility, and other OS X utilities. Power down the Mac and reboot while holding the Option key.
Select the OS X Install DVD from the boot menu using the arrow keys on the Mac's keyboard. Select the language you'd like to use when prompted Installing OS X Snow Leopard To install OS X Snow Leopard from the USB drive, you'll need to reformat the Mac's hard drive.
To do this, look towards the top of the screen and click on Utilities from the top menu and then click Disk Utility from the drop-down menu. Formatting The Mac's Hard Drive.
Click on the Mac's hard drive name. Click the Erase tab. Select Mac OS Extended (Journaled) from the Format drop-down menu.
Name the drive whatever you'd like Please note that all data on the Mac's hard drive will be erased, so backup all important files before proceeding. Press the Erase button to format the Mac's hard drive Starting The Snow Leopard Installer. Quit Disk Utility by pressing Command-Q on the keyboard. Press the Continue button. From the center of the window, select the Mac's hard drive. Press the Install button OS X Snow Leopard may take a bit of time to install depending on the Mac's hardware.
Upon completion, the Mac will restart and prompt you to create an account. Disk Utilities on the Snow Leopard USB Drive Additionally, you can access Disk Utility, Terminal, Safari (to access Apple help articles. Not general browsing) and other Mac utilities from the Snow Leopard USB drive. Boot the Mac to the USB drive using the steps shown above and click on the Utilities button from the top bar.
You can access all available utilities from this drop-down menu. It's nice to have these utilities available to use from the USB drive, especially Disk Utility. For example, if you believe your hard drive has died or is corrupted, you can boot your Mac from the USB drive and use Disk Utility to check the the hard drive's SMART status and repair said drive.
OS X Snow Leopard USB Drive, Completed In this tutorial, I've shown you how to create a bootable OS X 10.6 Snow Leopard USB drive. You can now use the USB drive to upgrade, maintain and restore Macs to OS X 10.6.
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