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1995 posts

Uber Geek

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#90585 24-Sep-2011 18:07
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About to upgrade from Snow Leopard to Lion...

Heres my options, is my thinking correct?

Option 1
- install Lion on top of Snow Leopard (of course will make a DVD with the downloaded file and another with the .dmg for booting).
- After the upgrade run time machine and restore my back up last made prior to upgrade.
- Do the updates.
- Back up to time machine on the new OS.
- Run the boot CD or USB key Ive made and do a clean install.
- Restore from time machine to the last back up I made.

Option 2
- Run the boot CD or USB key Ive made and do a clean install.
- Restore from time machine to the last back up I made
- Run the updates.

I like Option 1 as it has it enables the recovery partition to be installed and I can check if my apps copied across etc...but then again, if they didnt then my bad luck and too late. (as who really wants to roll back). 



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11542 posts

Uber Geek

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  #526255 27-Sep-2011 15:35
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Both options install the recovery partition. As I understand it, it is actually required to boot Lion.

For a really fast install create a partition and write the dmg image to that, then restart from that partition.

With #2 if you have space you can create a new partition using the tools provided by the Lion boot installer, then install Lion into that and make the transition in your own time adding things as required.

don't know about time machine.

hope that helps.

394 posts

Ultimate Geek

#526642 28-Sep-2011 10:16
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I've been trying to do a clean install of lion without much success.
I had already upgraded to Lion from Snow Leprard and didnt capture the iso.
So I download a copy from the internet and copied to to a USB disk and booted up. Works ok and it connects to apple and does the download thing but then it fails with

ep 26 00:37:35 localhost Install Mac OS X Lion[396]: Failed to validate file://localhost/Volumes/Image%20Volume/BaseSystem.dmg

Then I tried to just use the recovery option which makes you put in your app store account to download the OS... and at the end it gets the same error.

What gives?

BTW I'm trying to do the install onto the SSD that has replaced my superdrive.

Toys:  iphone 4s; PS3 good times.  13inch macbook pro.   ipad 3. ï£¿ 27inch imac.   airport express & time machine. raspberry-pi running xbmc and a gopro try hard.

T: jptocker@twitter



11542 posts

Uber Geek

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  #526904 28-Sep-2011 18:58
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Can't help with the error.

But I can tell you the install image you need to use is: "InstallESD.dmg" located in package Applications/Install Mac OSX This image does not require any file downloading during the installation.

The install package you purchased from AppStore is deleted during the upgrade so if you did not copy the install package before you ran the upgrade I'm not sure how you can retrieve it.

Maybe booting the recovery and a time machine rollback to SL then download the install from AppStore again? I'm new to Mac and have not even configured time machine yet so I'm just guessing there.

394 posts

Ultimate Geek

  #527539 30-Sep-2011 09:01
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In the end I put the SSD where my current hard drive was and put the superdrive back in. Then installed snow leopard and upgraded to Lion.

Now I need to stop it trying to boot my old disk. Changing the startup disk doesnt seem to fix it... bit of a headache really.

Toys:  iphone 4s; PS3 good times.  13inch macbook pro.   ipad 3. ï£¿ 27inch imac.   airport express & time machine. raspberry-pi running xbmc and a gopro try hard.

T: jptocker@twitter

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