How to erase Snow Leopard

Hi,
I just install Snow leopard, and i'm not happy with it, could you tell me how to reinstalled Leopard and find back my computer the way its was before Snow Leopard.
Thank you
Message was edited by: reza.z

I'(m not good on that i need somebody to explain me the steps how to do that
See:
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html

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Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
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         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
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Regards,

You just bought an iMac new or used?
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This machine has two 2TB HDDs that the previous owner has configured as a level 1 RAID. If I am to erase the startup disc do I erase both drives of the RAID set? If I'm not supposed to erase the startup drive, what do I need to do to get back to Snow Leopard? Thanks and thanks again!

The built-in checks will keep you from clobbering 10.8 Mountain Lion by Installing Snow Leopard over it (literally, 10.6 Snow Leopard Installer will see a later version in place, and knows it cannot install over a later version). So it says "Mac OS X cannot be installed on this computer..." and leaves off "... "in its current state."
You will need to Install on a 10.6 Snow Leopard-erased drive. Mac OS X Erase function proceeds to install a Partition scheme and a default Volume after erasing, because a truly blank drive is useless for most Users.
When you boot to the Installer DVD, you are running off the DVD, so all Hard Drives are available to be erased if that is your choice. All data on them will be discarded. If you erase one drive in a mirrored RAID set, normally the other drive would survive and the set would be degraded. But a new version of RAID was introduced right AFTER 10.6, and it is likely that 10.6 cannot read that RAID at all under any circumstances.

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I'm currently running on 10.5.8, and I just bought the Snow Leopard installation disc to update to 10.6.3.
My mac has been running on an external hard drive for about a year. The internal just stopped working.
I want to install Snow Leopard onto my external hard drive, but all of my files are on there, and I read that if I do the install, all of the data will be erased.
If I used time machine to back up the files before I do the install, are they at risk of being erased, since they will be back-uped on the external?
This is probably super obvious, but I want to be very careful with this.
Any help is very much appreciated!
^__^

1. The data won't be erased unless a problem occurs.
2. The Time Machine backup should be on a different drive, as drives can fail.
(92634)

Does anybody know how to install Snow Leopard on an external HD with Lion?

My MacBook Pro came from apple with Lion OS X 10.7.1 installed and it doesn't operate with Pro Tools LE 8.0.5 (or any other version for that matter and PT 9.0.5 is only in beta) So, I'm looking to partition Snow Leopard OS X 10.6 to my external HD so I can bypass the issue without compromising and downgrading my MacBook Pro (which I've been told is not possible anyway but I'm sure there is a way) and having to A) Pay out more money to avid and get PT 9 ( BETA) or B) Run a different DAW (Also costing more $$$) Any help would be MUCH appreciated!!!

Yes it's possible, you need another Firewire capable Mac#2 that can hold c boot off the 10.6.3 Snow Leopard Retail Disks and a Firewire cable and if necessary a FW 800 to 400 adapter.
First you boot into Lion on Mac#1 and use Disk Utility to Erase Free Space, this will take a few hours.
Then backup your data off the Mac#1 Lion partition to a external drive and disconnect. (for safety sake)
Then you create a second partition on the drive in Disk Utility, formatted OS X Extended (Journaled) under the Partition Tab.
While that is all going on, on the other Mac#2 that can boot off 10.6.3 disks, you do the same thing,
First you boot into Snow or Lion on Mac#2 and use Disk Utility to Erase Free Space, this will take a few hours.
Then backup the data off the Mac#2 main boot partition to a external drive and disconnect. (for safety sake)
Then you create a second partition on the drive in Disk Utility, formatted OS X Extended (Journaled) under the Partition Tab.
Hold c and boot Mac#2 off the 10.6.3 Retail Snow Leopard Disk (won't work with grey disks unless it matches the target machine model) and install onto the new partition on Mac#2, reboot holding option key and select the 10.6.3 partition, once in, use the Combo Update to get to 10.6.8. (must do)
Reboot holding T this Lion Mac#1 so it's in Target Disk Mode, connect the Firewire cable to the other Mac#2, then hold option key and reboot into the second partition on Mac#2. Download and use Carbon Copy Cloner to clone the new partition of Mac#2 to new partition of Mac#1
Reboot Mac#1 holding option key to boot into Snow partition on the factory Lion Mac#1.
If that doesn't work, you need to combine the 10.6.3 and the 10.6.8 Combo Update together in this process at the link below, and apply the 10.6.3 + 10.6.8 combined image in the same Target Disk mode fashion
https://discussions.apple.com/thread/3264421?start=0&tstart=0
Another method is if you can convince Apple to send you the 10.6.6 install disks for your machine, then use the Target Disk Mode approach to circumvent the firmware which is preventing you from booting off install disks from any previous version of OS X.
For example, my new 2011 MBP came with 10.6.6 grey install disks, but can't boot off the 10.6.3 Snow Leopard Retail Disks.
Another method would be to find another same exact machine as yours, came with 10.6.6 from the factory (even if upgraded to Lion it should still boot 10.6.6), thus will boot off the 10.6.6 install disks and install it onto your parttion.
Needless to say, after going through all this, you really need to make a clone of the partition once it's successfully installed.
Set the startup disk in system preferences to Snow.
https://discussions.apple.com/message/16276201#16276201

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http://jasonevangelho.com/2008/11/02/how-to-really-enable-remote-disc-dvd-drive- sharing-non-air-macbook/
All it took was two commands in Terminal.
I hope this will be helpful for others too.

Snow Leopard (SL) upgrade in my mac mini failed part way through and when I tried to re-do the upgrade, it would give me a blue screen (via DVI to my HD TV).
So, following the advice I found elsewhere, I did the following:
Booted up my 24" iMac, inserted SL disk into iMac.
Turned off mini, connected mini to iMac w/firewire cable.
Started mini and pressed and held the T key on the mini keyboard until it mounted on my iMac (seen in Finder) as a hard drive.
Started SL installation icon (iMac) and indicated that I wanted to install on the mini hard drive.
It went through a number of steps, then asked AGAIN which drive I wanted to install SL.
Then took quite a long time (upwards of 1.5 hours) to install, and the estimated time left during the install would sometimes appear frozen at 40 minutes, but the blue bar kept extending indicating it was making progress.
I was able to then boot SL on my iMac off the mini hard drive and configure everything (making sure that back to my Mac/mobile me was up and running and the proper in home network was correct).
Then "shut down" the iMac (which was still running off the mini hard drive), then powered down the mini.
Moved the mini out to it's normal place and reconnected to the HD TV and started it up and everything was perfect.
BTW, as many people know, if you're having video out difficulties with your mac mini, it's nice to be able to go "back to my mac" via another iMac to adjust the configuration. It's saved me a couple of times.

How to erase Snow Leopard

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