Boot from the Mac OS X Snow Leopard Install DVD, and from the you want to format your disk, I wanted to mention that this will erase all data.
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- Factory Wipe or install Snow Leopard..
- Install OS X Snow Leopard from a USB flash drive
- How to "clean install" Snow Leopard
Maybe you go through the entire Snow Leopard upgrade process only to realize that your one, essential, company VPN application isn't yet compatible. Maybe you accidentally lose files or apps in the upgrade process, or you just decide you hate Snow Leopard and want to go back to Leopard stat.
One great way to ensure you can go right back to your working Mac's state before an upgrade is to mirror the current state of your Mac on a bootable external hard drive. Even if you've got a Time Machine backup, grab another external drive and clone your Mac's internal hard drive.
With a bootable clone on hand, if anything goes wrong or you just want to boot back up into your old Mac's environment settings, apps, data, and all , you can do so by holding down the T key Option key, restarting your Mac, and choosing the clone as your bootup disk. Here's Apple's full set of system requirements. That is, you can't start with a formatted Mac hard drive and install Snow Leopard only, which is kind of a bummer for geeks who like to do totally fresh, from-scratch installations.
Correction and update: We have confirmed that the preview of Snow Leopard DOES offer a standalone installer that works on a freshly-formatted hard drive without an existing Leopard installation or DVD. While we can't absolutely say before Friday whether or not the final release will work this way, it's very possible it will. My apologies for the mistake! Thanks to commenters RudolphDer and dark42 for asking!
If you're already running a relatively clean installation of Leopard, and you want to make this update as easy, fast, and painless as possible, you're just going to pop your Snow Leopard DVD into your Mac's drive and go. I did this using the Dev Preview of Snow Leopard on a well-used and cluttered Mac, and things went just fine. This is the upgrade path Apple wants you to take and suits most folks—with a good backup, you've nothing to fear. The only possible disadvantage to this approach is that some old logs and system files you don't need might stick around.
It was true years ago, but modern drives automatically map out bad blocks as they are encountered. Zeroing the drive these days is only important if you want to wipe the data and prevent it from being recoverable. I really want to do a totally clean install of ML. Is there a straightforward way to accomplish that?
Factory Wipe or install Snow Leopard..
You can download the Mountain Lion installer, then make a bootable install disk out of it and use that to erase the hard drive and install ML. If you make a bootable install disk according to those directions, then you can install in an offline situation. Search for:. Step 1: Back up! Step 3: Reinstall This step is pretty simple — just follow the directions to reinstall the system on the newly-erased drive. Step 4: Update Once your system restarts successfully, you will need to be sure that it is fully up-to-date.
Install OS X Snow Leopard from a USB flash drive
Step 5: Reconfigure Once your clean, new system is up and running and fully updated, work on getting all the settings back to the way you like them. Step 6: Import data selectively! Step 7: Reinstall applications At this point, you can start reinstalling any other applications you might have had installed. April 11, at pm. Thomas says:. Someone says:.
April 14, at am. Tom says:. April 13, at am. April 13, at pm. Timothy says:. April 15, at am.
Backup all your documents and files to an external hard drive. This is necessary to keep all your documents, music, videos and such. You will need to copy them back onto your Mac manually later on. In the sidebar find the drive that contains Lion, select it and click on the Partition tab.
How to "clean install" Snow Leopard
Quit Disk Utility to return to the installer screen and continue with the Snow Leopard installation. When Snow Leopard has been installed successfully, manually copy your files across from your backup disk.
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Run Software Update to make sure your Mac is fully up to date. You will also need to re-install any applications. Downgrading using Time Machine is probably the easiest way to go back to Snow Leopard, because it returns the OS, applications and files exactly back to the state they were in before you installed Lion. When the list of startup options is displayed, choose Recovery HD to start in recovery mode. Make sure that your Time Machine backup disk is already connected. In the list shown, click on the volume that contains your backup.
Dates and versions are clearly displayed so just use the most recent Snow Leopard backup before you installed Lion. The last task is to manually copy over any documents that may have changed since you installed Lion.