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how to remove Lion Recovery disk



If you have reverted your mac to Snow Leopard from Lion, its important that you also remove the Recovery HD, as it can compromise the security of your Snow Leopard installation (for security issues with Lion, see here). Reverting to SL via Time Machine or restoring from a clone will leave the Recovery partition in place, meaning anyone can boot into it and reset your Snow Leopard passwords merely by restarting your mac while holding down the ‘option’ key.

To remove the Recovery disk follow this procedure:

1. Revert back to Snow Leopard using Time Machine or a clone.

2. Once you’re up and running and have confirmed everything is good, go to Terminal (Applications > Utilities > Terminal) and paste/type this command to confirm the presence of the Recovery HD:

diskutil list

then press ‘Return’. If you see a partition labelled something like this

Apple_Boot Recovery HD (see image above)

then you will need to continue with the rest of the procedure. If the Recovery HD is not listed here, you do not have the Recovery partition and need not worry further.

3. If you find the Recovery HD in the list, paste the following command into Terminal:

defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

Press ‘Return’.

Now open Disk Utility (Applications > Utilities > Disk Utility). In the menubar at the top, choose Debug > ‘Show every partition’

On the left in the main Disk Utility window, you’ll be able to see ‘Recovery HD’ (it’ll be greyed out). You can click ‘Mount’ in the taskbar to make it active, and you can now delete it using control-click/right click – erase or by using the ‘erase’ tab in DU’s window.

If you want to confirm that the Recovery disk is no longer present, go back to Terminal and type the command from step 2.


Related posts:
how to secure your mac (OS X Lion)

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upgrading to Lion – the golden rules!

Nearly three months since the initial public release of OS X Lion 10.7 and a couple of updates later (we’re currently at Release 10.7.2) a lot of upgraders are reporting problems to Apple Support Communities. These problems could be avoided or their severity reduced if people upgraded in the right way.

There’s a wrong way? Oh yes…the Apple way is to encourage you to click on the App Store, click on Lion, pay your money, sit back and watch as everything falls into place without barely a finger lifted from the user. That’s great — when it works, but as noted, a lot of people are finding that all sorts of things are going wrong from software incompatibility to hardware incompatibility and sometimes (like in my own case) just plain user incompatibility (yes, some of us — and it could be you too! — are just not that thrilled with the reduced configurability and usability of Lion compared to Snow Leopard, even when it works as intended). There’s also some reported problems even with Apple’s own products: Time Machine, Time Capsule and Spotlight are all being reported as having problems for some users.

But much of this need not give you a headache, put your computer out of action or require a call to Apple Support if you follow the golden rules to doing any major OS upgrade.


Golden Rule No. 1: Check the compatibility of your key software tools.

Why do I need to do this?
Lion does not support a lot of older technologies such as Rosetta and PowerPC apps. If you make heavy use of these programs in your daily use, you’re going to need to upgrade those too or continue to run Snow Leopard on an external disk.


Golden Rule No. 2: Buy an external disk and clone your current system to it.

Why do I need to do this?
Without a doubt, this is the most important thing you should do before upgrading. What cloning means is that if anything goes wrong with the install, if it doesn’t work, or it isn’t to your taste, you can simply boot back into your old system within minutes (no longer than it takes to restart the computer, in fact). Your clone is your insurance, a fail-safe against the unexpected. Don’t even think about hitting that App store upgrade till you have your clone in the bag.

Or what? Simply put, if you don’t make a clone of your system, you’re going to have to live with any problems until you can work out a way to either solve them (and some issues haven’t even been resolved yet) or revert back to your previous OS the hard way, with the potential of data loss.

Although cloning your system will cost you the price of an external USB or Firewire hard disk, it’s an investment you should not overlook. Even if your upgrade goes well, keep the clone for a month or so till you’re sure everything works fine. Once you’re happy, you can use that disk to clone your Lion OS regularly as an incremental backup (like Time Machine only more configurable and less erratic!).


Golden Rule No.3: Make sure you have a bootable DVD or USB recovery disk.

Why do I need to do this?
Unlike every other proprietary OS upgrade ever, Lion is downloaded from the internet and does not come with an install disk. Does it matter? Well, yes. Sometimes Lion doesn’t install properly for a number of different reasons and sometimes your system just goes belly-up. Now you may have heard that Lion comes with its own recovery partition, but that assumes that the recovery partition installs properly, and it relies on having an internet connection. Re-downloading the installer takes a lot longer than simply copying it the first time and making a bootable Lion recovery disk in case of emergency.


Golden Rule No.4: Do a clean install to your internal disk.

Why do I need to do this?
A clean install basically means two things: you wipe the history of the disk you’re going to use for your new OS, and you don’t import any settings from your previous OS. This should ensure that the OS installs exactly as it was designed, without being infected with any hidden or unknown problems from your previous OS install.


Golden Rule No. 5: Use the clone to add manually the stuff you use everyday, and as-and-when you need it for other stuff.

Why do I need to do this?
Using the auto-upgrade, Time Machine or Disk Migration features have been known to introduce problems such as corrupted files and permissions that Snow Leopard ignored for some reason or other but which Lion won’t tolerate, and/or files and settings which are just plain incompatible with Lion. Trying to find out what is causing your system problems is a gruelling process if you just import everything en masse. On the other hand, if you import things manually over time, it’ll be both a lot easier to figure out which change caused the problem but also — using your clone — to roll your system back if needs be.

Let us know your upgrade stories in the Comments below. Was it just one-click to happiness or a whole world of pain? 😉


how to turn a Lion into a (Snow) Leopard

Well, a lot of folks are so unhappy with the new Lion operating system that they’re returning to Snow Leopard. Even some people who are buying new Macs with Lion pre-installed are wishing they could get rid of the new hairy cat for the cooler and more efficient previous one.

In this post I’m going to point you to a few links that should help you do just that.

What you will need:
Snow Leopard Install disks
External Drive
Carbon Copy Cloner (free software).

Safety first, folks! Go to How to Clone your hard drive — do this before you start! It’s your insurance, and it’s far better and easier than Time Machine. Even if you use TM, make a clone too!

Take a look at How to Install Snow Leopard on an External Disk — If you’ve already got Lion on your internal, install SL on an external first. Try it out for a week or so. If you’re convinced you’re going to revert fully (rather than just run both in tandem, like I do), then clone it back to your internal HDD using carbon copy cloner, as detailed above in How to Clone your hard drive.

Finally, How to revert your Mac to Snow Leopard offers a comprehensive guide from ASC community member ds store.

Good luck!

Have you reverted to Snow Leopard? Let us know how it went, and why you decided to ditch the Lion in the comments below.

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