Either Windows or Mac OS X will work. If you're using a Windows computer, it needs to have a DVD/Bluray burner (just about every DVD/Bluray drive nowadays can act as a burner, too). A Hackintosh-compatible computer with 10 GB+ of free space: This is the computer where you will install OS X Mountain Lion. Mac OS X Mountain Lion. kirkmc adds: I haven't tested this. Given the cost of USB sticks, and the fact that, if you do want an installer, it's better to have the most recent one, I've gone that route using Lion DiskMaker.Some people may prefer DVDs, but another factor is whether or not your Mac has an internal DVD drive; my Macs - a Mac mini and a MacBook Pro - do not, so USB is easier than using an external drive. OS X Mountain Lion (version 10.8) is the ninth major release of macOS, Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so.

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Hint author here. I'll agree that in most cases you would be better off using a USB flash drive (8 gig drives cost practically nothing these days.) In my case, my employer asked that I create some bootable DVDs, and I didn't want to have to order a bunch of dual-layers. I'm sure there are others in similar circumstances.

I haven't tried the script, but it probably won't work in bash without properly escaping and/or quoting the paths with spaces on them.

You're absolutely right - good catch. The paths were fully escaped when I submitted the hint, but it looks like the backslashes got stripped out after submission.
I'll see about getting it fixed. In the meantime, you can download the escaped version here:
https://dl.dropbox.com/u/10577704/create-mountain-lion-dvd.zip

I've fixed it.

Typhoon14 said:
'but it looks like the backslashes got stripped out after submission.'
Were they back slashes, or forward slashes?

deleted

I had the install app in a Downloads folder. You will need to change that reference to where your copy of the app is located. This ran in Terminal, after I saved the text as 'MLresize.sh', using nano, and ran on the file.

(I've got a lot of blank DVDs. And they won't get zapped by lightning like my Base Station did.)

The script ran in a few minutes, much less time than actually burning the DVD.
I just dropped the created .dmg file into Disk Utility, selected it, and clicked on burn.
After burning, the disc shows in System Preferences->Startup Disk as bootable.
Although I haven't tried it out yet.

How exactly does this work? How can you reduce the uncompressed size of an image without losing any data?

The image itself has a fixed size of 4.75 GB, but contains only 4.35 GB of data. All we're doing is trimming the free space.

So you can't just use Image/Resize in Disk Utility? (I'd try it, but I don't have Mountain Lion.)

Resize only works for read/write disk images, so, no.

I just copy/pasted the stuff for terminal, not bothering with the bash and everything worked as advertised. Verifying burnt disc now. Thanks!!

@kirkmc Why do you need Lion DiskMaker? Can't you just restore the InstallESD image in Install X Mountain Lion/Contents/SharedSupport using Disk Utility?
I have an installer on a USB and an SDHC Card using the restore method.

@derekJAB,
you can in fact restore InstallESD.dmg. Just remember to mount the dmg for Mountain Lion.
If you don't, disk utility will throw you an error.

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for somehow I need to add 'sleep' before detach to avoid resource busy
#! /bin/bash
# 2012-08-07 01 prw from Mac OS X Hints web site...
# added backslash before spaces in image names...
# Should be run on /Volumes/yourhddvolumename not on the SSD
# 2012-08-07 02 prw References are all relative, not absolute. So SSD it is.
# 2012-09-13 03 JFOC adding some sleep to avoid resource busy on detach
# Remove any old copies of the DVD image before we begin.
rm -f /private/tmp/Mountain Lion DVD Image read-write.dmg
echo 'Creating DVD Image...'
hdiutil create -size 4.2g -volname 'Mac OS X Install ESD' /private/tmp/Mountain Lion DVD Image read-write.dmg -fs HFS+ -layout SPUD
hdiutil attach -nobrowse /Volumes/Macintosh HD/Users/admin/Downloads/Mountain Lion 10.8/InstallESD.dmg
hdiutil attach -nobrowse /private/tmp/Mountain Lion DVD Image read-write.dmg
echo 'Copying Mountain Lion to new image...'
cp -pRv /Volumes/Mac OS X Install ESD/* /Volumes/Mac OS X Install ESD 1/
sleep 10
hdiutil detach /Volumes/Mac OS X Install ESD 1
sleep 10
hdiutil detach /Volumes/Mac OS X Install ESD
sleep 10
echo 'Converting to read-only...'
hdiutil convert /private/tmp/Mountain Lion DVD Image read-write.dmg -format UDZO -o ~/Mountain Lion DVD ImageLion.dmg
sleep 10
rm -f /private/tmp/Mountain Lion DVD Image read-write.dmg
echo 'Image Creation Complete. Please burn '~/Mountain Lion DVD ImageLion.dmg' to a DVD using Disk Utility.'
open ~/
#-----------------------------------------------------------------------------------------------------------

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If you do want to get the Mountain Lion installer InstallESD.dmg to fit on a single layer DVD, you can use the overburn feature of hdiutil in Mac OS X.
AFTER inserting a blank DVD, bring up terminal, navigate to the dmg folder and type:
hdiutil burn InstallESD.dmg
Depending on your brand of DVD your mileage may vary.

You can infact burn the installer to a single layer DVD, using a feature called overburn. This is much simpler than it sounds..
AFTER inserting a blank DVD, bring up terminal, navigate to the dmg folder and type:
hdiutil burn InstallESD.dmg
Depending on your brand of DVD your mileage may vary. It's not unusual to get errors after finishing the burn but as long as the Finishing Burn message is shown, the disc will function as expected.

I think using any of these methods will cause the image to have a different checksum than the original. If that's not important to you, don't fret.
$ man hdiutil
-[no]optimizeimage do [not] optimize filesystem for burning.
Optimization can reduce the size of an HFS or
HFS+ volume to the size of the data contained
on the volume. This option will change what
is burned such that the disc will have a dif-
ferent checksum than the image it came from.
The default is to burn all blocks of the disk
image (minus any trailing Apple_Free).

Apple on Wednesday released Mountain Lion, the operating system otherwise known as OS X 10.8. Mountain Lion adds several iOS-inspired apps and features, wholly embraces iCloud, and, of course, drops support for some older Macs.

Read Jason Snell’s full review of Mountain Lion.

Like Mac OS X Lion, Mountain Lion is available exclusively through the Mac App Store as a 4.34GB download. But it comes at a discount from its predecessor: Mountain Lion costs $20, while Lion cost $30 when it arrived a little more than a year ago. (If you purchased a new Mac on or after June 11, 2012, you can upgrade for free through Apple’s Up-to-Date program.) Your Mac will need to be running Snow Leopard or later to launch the Mountain Lion installer.

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Some Macs that could run Lion can’t run Mountain Lion. You’ll need an iMac (Mid 2007 or newer), MacBook (Late 2008 Aluminum, or Early 2009 or newer), MacBook Pro (Mid/Late 2007 or newer), Xserve (Early 2009), MacBook Air (Late 2008 or newer), Mac mini (Early 2009 or newer), or Mac Pro (Early 2008 or newer) to install the new operating system.

Many of the features introduced in the new OS X update will be familiar to anyone with an iOS device.

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New apps in Mountain Lion include Reminders, Notes, and Game Center, each of which looks like—and syncs seamlessly via iCloud with—its iOS counterpart. Mountain Lion also includes Messages, née iChat, which now offers support for sending iMessages to other Mac and iOS device users.

Also making the leap from iOS to the Mac with Mountain Lion is Notification Center, a single spot that assembles alerts from Apple’s apps, along with third-party apps and websites that integrate with the technology. Mountain Lion delivers support for AirPlay mirroring to the Mac, letting Mac users send their display to an Apple TV.

The iOS-to-Mac approach in Mountain Lion mirrors the one that Lion took last year. But Ross Rubin, a principal analyst with Reticle Research, expects the transition to be a lot less jarring for users. “[Apple] has focused more on apps and information that consumers will want across platforms such as notes, reminders, messages and notifications as opposed to Lion introductions of full-screen apps and Launchpad,” Rubin told Macworld. “Whereas Launchpad may have seemed foreign to the Mac, Notifications feel as comfortable if not more comfortable on OS X than on iOS.”

Mountain Lion also introduces a number of new technologies to OS X including Gatekeeper, a security feature that gives users control over which apps can launch on their Macs; significant Mail and Safari upgrades; system-wide sharing features; and built-in dictation among other capabilities.

Mountain Lion’s arrival comes at the same time Microsoft is prepping an OS update of its own: Windows 8 is slated to be in consumers’ hands by October. “In contrast to Microsoft, which is creating an operating system with a split personality in Windows 8, Apple is keeping all Mac apps optimized for a user interface driven by a pointing device,” Rubin said. “Mountain Lion also takes further steps to tie the Mac in more closely with the cloud, a strategy that is also important to Microsoft as they pursue Google’s home field ecosystem advantage.”

Real mountain lions are ambush predators: They sneak up on their prey unannounced for surprise attacks. Perhaps Apple took inspiration from the new OS’s namesake when the company first unveiled Mountain Lion last February, announcing the upgrade through selected press outlets but without the fanfare of a press event. Wednesday’s official release of the new operating system was less surprising; the company promised a July release during June’s Worldwide Developers Conference, and Apple executives gave the world a one day heads-up Tuesday about Mountain Lion’s release date when announcing its quarterly earnings.