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Thủ thuật How to Make an OS X Yosemite Boot Installer USB Drive

Discussion in 'Apple - macOS' started by ThienBui, Oct 17, 2014.

  1. ThienBui

    ThienBui Fix Something with us
    Staff Member

    Dec 13, 2013
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    Now that OS X Yosemite is available, many users may wish to create a bootable installer drive from something like a USB flash thumb drive or another disk. This allows for several things, the ability to upgrade multiple Macs without having to re-download the installer, the ability to perform a clean install, and also the convenience of having a separate bootable reinstallation drive in the event you need it for serving a Mac.

    Creating a Yosemite installation drive that is bootable is quite simple, but it’s a multiple step process. Before you begging, make sure you have the following basic requirements met:

    Of course, we’re assuming the destination Mac(s) that are going to get Yosemite are compatible. Basically, if the Mac is capable of running OS X Mavericks, it is capable of running OS X Yosemite too.

    How to Create a Bootable OS X Yosemite Installer Disk in 2 Steps
    For the purposes of this walkthrough, we’re going to use a 16GB USB flash thumb drive, but you’re free to use whatever you want, and you could even use an external hard drive if you really wanted to. The convenience of a portable flash drive is undeniable so it’s preferred if you’re going to be updating multiple Macs. Let’s get started:

    Step 1: Format the USB Drive to be Bootable
    This is going to format the drive so that it will be a bootable installer, without doing this the drive may not be bootable. If you don’t want to erase the drive, find one you don’t mind formatting instead.

    1. Connect the USB drive to the Mac and launch Disk Utility, then select the drive from the left side drive list
    2. Click on the “Erase” tab and format the drive as “Mac OS Extended (Journaled)”, then choose “Erase” and confirm
    3. Next go to the “Partition” tab and under ‘Partition Layout’ click on the pulldown menu, changing it from “Current” to “1 Partition”

    4. Change the name to “Untitled” from ‘Untitled 1′ then click on the “Options” button
    5. Choose “GUID Partition Table” as the partition scheme and choose “OK”

    6. Click “Apply” and confirm the creation of the partition
    7. Quit out of Disk Utility when finished
    Now that the drive is ready, you can move on to making the actual installer.

    Step 2: Making the OS X Yosemite Installer Drive
    The next step will actually make the installer drive from the previously formatted USB disk. If you already have the OS X Yosemite installer application in the /Applications/ folder on the Mac, you can skip directly to step 3:

    1. Download OS X Yosemite from the Mac App Store, it’s free (direct link) – DO NOT INSTALL IT YET
    2. When the download completes and the “Install OS X Yosemite” app launches, quit out of it immediately

    3. Launch Terminal app and enter the following command exactly, copy and paste works fine:
    4. Enter the administrator password when requested (this is required to use the sudo command – the password will not show up and it looks as if you’re not entering anything, that is normal behavior for the command line), then hit the RETURN key to start making the installer
    5. You’ll see a series of message like the following, let it finish until you see the “Done” message – this may take a while as multiple GB of data have to be transferred:
      "Erasing Disk: 0%... 10%... 20%... 30%...100%...
      Copying installer files to disk...
      Copy complete.
      Making disk bootable...
      Copying boot files...
      Copy complete.
    6. When finished and the terminal reads “Done”, exit out of Terminal, you’re ready to use the bootable installer drive

    That’s all there is to it. Your freshly made OS X Yosemite install drive will be visible in the Mac Finder:

    Now you just need to boot from the freshly made OS X Yosemite drive, do that by rebooting the Mac and holding down the OPTION key and selecting the “Install OS X Yosemite” drive upon boot.

    If the drive does not boot, you almost certainly skipped the first step which was to partition the drive as GUID, or perhaps interfered with the syntax in the command. You can go through the process again to be sure.

    Nguồn: osxdaily
    #1 ThienBui, Oct 17, 2014
    Last edited: Nov 5, 2015
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  3. vanminhclean

    vanminhclean New Member

    Dec 12, 2014
    Likes Received:
    không hiểu
  4. ThienBui

    ThienBui Fix Something with us
    Staff Member

    Dec 13, 2013
    Likes Received:
    Hiểu đơn giản là tạo USB cài đặt MAC OS bằng Terminal:

    Mở Terminal và dán đoàn code này vào rồi enter.

    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

    chú ý. ( Untitled ) là tên ổ USB của bạn đã Format trước đó.

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