Now we are going to restore “BaseSystem.dmg” disk image on the USB drive. After doing that open the Disk Utility and you will see the file “BaseSystem.dmg” is loaded in the Disk Utility on the left side. Load the “BaseSystem.dmg” file into the Disk Utility, right-click on the file and choose “Open With” > “Disk Utility” option. Open the Disk Utility again from “Applications” > “Utilities” > “Disk Utility” or by using Spotlight search. Open “Contents” > “SharedSupport” folder and here you will see “InstallESD.dmg” file, double click to open the file and OS X may starts verifying this file so let the verification process finished.Īfter that you will see a folder with the following content in it, “BaseSystem.dmg” is the file that we need and it was hidden, so now you know that why we show the hidden files in above steps. Cmd+click on it to view the menu, select “Show Package Contents”. Open Applications, here you will see your downloaded OS X Yosemite file “Install OS X 10.10”. Type the following two commands one by one:ĭefaults write AppleShowAllFiles YESįirst command is going to show hidden files and the second one is to restart the Finder so we can see the instant effect of first command. Open Mac “Terminal” command line: press cmd+space keys and type Terminal in the spotlight, click the Terminal from search results or just open the Terminal from Applications > Utilities > Terminal. Showing hidden files is required, because there are few hidden files in the OS X Yosemite installer package that you need to unhide first to write them on bootable USB drive. Once done, you will notice a new drive name will be displayed on the left side, the name that you given in the partition information. This will take some time to format and making USB drive as a 1 partition. To complete the creating partition process hit the “Apply” button and then “Partition” button. Then enter the Partition information Name: ”osxyosemite”, Format: “Mac OS Extended (Journaled)”.Ĭlick the “Options” button to select the partition scheme, so select “GUID Partition Table” option and click OK button. Select the drive and then do the following steps to create a single partition that is required to make USB installer drive for OS X Yosemite 10.10.Ĭlick on “Partition Layout” drop-down menu and select “1 Partition” option from it. Once you attached the USB drive, it will shown on the left panel of Disk Utility. Plug the external USB drive into Mac (make sure you save your stuff from it). Open Disk Utility from “Applications” > “Utilities” or press “cmd+space” keys form keyboard to find “Disk Utility”.
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