Uninstall lion

HI,
I have installed Lion (rather thoughtlessly) and find several issues with software compatability, which mean I would like to revert to SL for the time being. Foolishly I did not perform a Time Machine back up prior to installing Lion (I know - I must be "loosing" it in my advancing years.) Also I am fairly new to Mac's so some "obvious" solutions may not be apparent to me. I have read several articles regarding performing a clean install of SL or partioning a HD. But I'm wondering if an alternative option might exist for me.
My Mac Pro has TWO HD's.
HD -1, (1TB) has my OS 10.7.2 (partioned to run boot camp at 80 gb) - I use this HD for everything and transfer any files I want to back up to HD-2 so essentially HD-2 is a "clean" storage drive.
HD-2 (2TB) is used only for back up of files etc. (How I came by this monster is another story).
At some point in the future no doubt Lion compatability issues with my music production software and hardware will be resolved so I'm wondering about leaving HD-1 alone for now and simply installing Snow Leopard from my original disk onto HD-2 and from there run my production programmes. Is the feasible and what issues might arise? (How would I select the HD to boot at start up for instance? Would I have to re-install at the programmes on HD-2?).
Any help, suggestions or comments would be appreciated.
Thanks.

1. Yes. You may want to turn off Spotlight indexing from one OS.
2. Press the Option key at startup, or use the Startup Disk pane of System Preferences.
3. Programs with system components will need to be reinstalled. Those which don't can be used from their current locations, but you'll need to transfer over the preferences manually or reenter them.
(61011)

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1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
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See this Discussion:
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Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
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cameron138 wrote:
Lion 10.7 is not supported by my university (wasnt aware) and now I can't use the wireless printing function.
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Message was edited by: vea1083

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I am trying to follow Pondini's instruction on Time Machine FAQ n˚14 to uninstall Lion back to SL from a Time Machine back up using my orignal SL install disc.
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You can't install this version of the application Install Mac OS X with this version of Mac OS X
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http://support.apple.com/kb/HT4713
http://support.apple.com/kb/HT4718
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http://support.apple.com/kb/HT4649

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Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

Uninstall lion

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