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Old Jul 25, 2012, 11:22 AM   #1
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Create a Bootable Mountain Lion USB Key Installer







Mountain Lion is the second release of OS X to be delivered via the Mac App Store. Like with Lion, users can create their own bootable USB key installer to use as a recovery disk or to install Mountain Lion on multiple Macs without needing to download the 4GB installer multiple times.

Ars Technica has an excellent walk-through using either the Disk Utility application that is included on every Mac, or the newly updated Lion Diskmaker app that automates the process of creating a bootable install key.

The biggest catch to the whole process is to make a copy of the Mountain Lion installer before actually installing Mountain Lion, otherwise the installer will need to be redownloaded from the Mac App Store.

(Image via Ars Technica/Chris Foresman)

Article Link: Create a Bootable Mountain Lion USB Key Installer
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Old Jul 25, 2012, 11:35 AM   #2
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The Lion Diskmaker link... well, the link isn't bad, I don't think, but the server it points to isn't happy...
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Old Jul 25, 2012, 11:44 AM   #3
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The Lion Diskmaker link... well, the link isn't bad, I don't think, but the server it points to isn't happy...
Here you go...

http://blog.gete.net/lion-diskmaker-us/
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Old Jul 25, 2012, 11:46 AM   #4
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Yay, I'm about 5 minutes too late since I already installed ML. Oh well.
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Old Jul 25, 2012, 11:47 AM   #5
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Tres bien, merci!
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Old Jul 25, 2012, 01:08 PM   #6
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Hi, sorry for the ignorance but does this method work for doing a clean install of ML and not just upgrading from an existing installation of Lion?
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Old Jul 25, 2012, 01:52 PM   #7
iSee
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I'm feel like ranting...

"Create a Bootable Mountain Lion USB Key Installer"

No! I will not!
I fell for this with Lion and spent X wasted minutes of my life creating a USB key installer of Lion which I never used.

I'm letting is all hang out this time around; no ML USB key installer for me!

Quote:
Originally Posted by h1r0ll3r View Post
Yay, I'm about 5 minutes too late since I already installed ML. Oh well.
You got lucky in my opinion.
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Old Jul 25, 2012, 01:55 PM   #8
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Quote:
Originally Posted by iSee View Post
"Create a Bootable Mountain Lion USB Key Installer"

No! I will not!
I fell for this with Lion and spent X wasted minutes of my life creating a USB key installer of Lion which I never used.

I'm letting is all hang out this time around; no ML USB key installer for me!
Yeah that'll show em'!
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Old Jul 25, 2012, 02:00 PM   #9
FearlessFreep
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Unlike most of America I sadly do not have a true high-speed option for internet at my house. Thus I bring my MBP to work and use this method to generate an install package for my iMac at home. It's really the only way to do multiple installs if you don't have a good internet connection.

Reminder: you MUST copy the package before the actual install, but it's easy.
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Old Jul 25, 2012, 02:51 PM   #10
NY Guitarist
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Can you download ML without installing it?

I have a Mac Pro in a temporary office without internet access and would like to install ML on a separate HD to test.

BUT my MBP is running SL and, without getting into the details, needs to stay on SL for now, but it's the only machine with internet access right now.

So I would like to be able to download ML without installing it, and then create a USB installer.
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Old Jul 25, 2012, 03:18 PM   #11
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Can you download ML without installing it?

I have a Mac Pro in a temporary office without internet access and would like to install ML on a separate HD to test.
Yes. I downloaded ML and made the ML USB Key installer. I then created a second partition on my Mac (leaving Lion on the first partition so that I can still run FCP7 and CS4.) I'm currently installing ML on the second partition.
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Old Jul 25, 2012, 03:28 PM   #12
Roc P.
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I tried this method and at the very end got this error:

"Could Not Restore - Invalid Argument"

But when I removed the USB Key from my iMac and put it back into the USB slot, the installer was on it.
(I haven't tried to use it though, I had to go to work)

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Old Jul 25, 2012, 04:41 PM   #13
calderone
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Originally Posted by Roc P. View Post
I tried this method and at the very end got this error:

"Could Not Restore - Invalid Argument"

But when I removed the USB Key from my iMac and put it back into the USB slot, the installer was on it.
(I haven't tried to use it though, I had to go to work)

http://forums.macrumors.com/showpost...2&postcount=62
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Old Jul 25, 2012, 04:45 PM   #14
Roc P.
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Yeah like I said, I followed the directions completely.

This is what I did:

1. Source: DMG, Destination: Flash Drive (The brand name and capacity)


I didn't mount the .dmg
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Old Jul 25, 2012, 04:56 PM   #15
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Yeah like I said, I followed the directions completely.

This is what I did:

1. Source: DMG, Destination: Flash Drive (The brand name and capacity)


I didn't mount the .dmg
Actually their guide is incorrect, and does not match number 1.

Restore the DMG not the volume created when you erase, but to the drive itself.

FYI. They have added a note that it works despite the error.
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Old Jul 25, 2012, 05:00 PM   #16
Roc P.
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Actually their guide is incorrect, and does not match number 1.

Restore the DMG not the volume created when you erase, but to the drive itself.

FYI. They have added a note that it works despite the error.
Hmm I'm not sure I follow...

This is the guide I used, it's meant for Lion but I thought it would work:

http://lifehacker.com/5823096/how-to...or-flash-drive

Maybe my USB Key will still work then despite the error.
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Old Jul 25, 2012, 05:04 PM   #17
calderone
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Originally Posted by Roc P. View Post
Hmm I'm not sure I follow...

This is the guide I used, it's meant for Lion but I thought it would work:

http://lifehacker.com/5823096/how-to...or-flash-drive

Maybe my USB Key will still work then despite the error.
Oh sorry, thought you following the Ars guide.
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Old Jul 25, 2012, 05:07 PM   #18
Roc P.
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Oh sorry, thought you following the Ars guide.
No it's my bad, I should have been more specific. I think I will still redownload ML and try it again just in case. Couldn't hurt I suppose.
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Old Jul 25, 2012, 06:17 PM   #19
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Interesting thread. After downloading ML but before installation can't you just run time machine and save it in there for future use?
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Old Jul 25, 2012, 06:55 PM   #20
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Great. I'm glad we can still do this like we did Lion. It's nice keeping a physical copy of the installer on USB.
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Old Jul 25, 2012, 08:57 PM   #21
SoGood
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Apart from this, what's useful to have for ML users is to install a Recovery drive partition on a USB stick. This is a bootable partition (Cmd-R at boot time) that can be used in emergencies.
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Old Jul 25, 2012, 09:21 PM   #22
ATC
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Used the new Lion Diskmaker app/script and it worked like a charm. Super easy too. I was a able to do a full clean install and ML is running like a dream on my 09' iMac.
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Old Jul 25, 2012, 09:44 PM   #23
Variant
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Originally Posted by felipecerda View Post
Hi, sorry for the ignorance but does this method work for doing a clean install of ML and not just upgrading from an existing installation of Lion?
I have the opposite question. I did this last year with Lion and I believe that the ONLY option was to do a clean install. Can anyone who has used this method tell me what install options are available?
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Old Jul 25, 2012, 10:15 PM   #24
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Yay, I'm about 5 minutes too late since I already installed ML. Oh well.
Do it like me then, re-download it but this time make the recovery disk instead.
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Old Jul 25, 2012, 10:23 PM   #25
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I have the opposite question. I did this last year with Lion and I believe that the ONLY option was to do a clean install. Can anyone who has used this method tell me what install options are available?
I used this method (actually a very similar one, but creates the same type of boot disk), and upgraded both my Macs running Lion to Mountain Lion, not clean installs. If you were upgrading from anything but Snow Leopard, however, you would not be able to perform an upgrade, so perhaps that's what you were running into before?

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