Mac: Create an OS X 10.8.

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Create an OS X 10.8. 113 • 71041Thanks for sharing longago on
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The installation method is the same as the installation of the USB flash drive for lion, except that the system file is replaced with mountain lion.

First, we need to download the OS X 10.8 Puma Installation File in two ways:
1. From the Mac App Store, the current beta version is converted from the Mac App Store using a redemption code. In the future, the official version will be downloaded from the Mac app store. After the download is complete, go to the application folder and find the app file "Install Mac OS X mountain lion" (the current version has the suffix preview 1)

Second, download through other network methods. Generally, a DMG (or other compression formats) file is downloaded. decompress the file first, and then obtain an "Install Mac OS X mountain lion" (Suffix: preview X) drag it to the application folder.
Preview1: http://www.macx.cn/thread-2036677-1-1.html

Our goal is to find this file. The current version is "Install Mac OS X mountain lion preview 1"

Right-click the file and select "show Package content"

Open the contents directory, open the sharedsupport directory, and find the "installesd. DMG" file, for example:

Double-click the "installesd. DMG" file and extract it to a drive letter similar to a temporary image on the desktop, for example:

Next, prepare a USB flash drive and start making the drive.
At present, it is recommended that the size of the USB flash drive be at least 5 GB. Or you can divide a partition from your mobile hard disk.
We made an 8 gb usb flash drive below:
Insert a USB flash drive and open the application-utility-disk Tool
Select the USB flash drive from the list on the left, and select the "erase" tab on the right. Select "Mac OS X extension (Log Type)" under the tab. The name can be set as needed. Finally, select "erase" in the lower right corner, for example:

OK. macx is named here. All right, select macx from the list on the left, and click "Restore" on the top of the label on the right"

Then, in the left-side list, find the newly generated Mac OS X install ESD on the desktop, and drag and drop the source disk and target disk in the following mode:

After you have finished the installation, you can restore the instance. After the recovery is complete, you can complete the installation of the USB flash disk.

When enabling the computer, press and hold the option and choose to start from the installation USB flash drive named "Mac OS X" to install the new system on the computer.