Help needed - 2 OS's in 2 hard drives

Hi,
My Mac Pro currently has the 320GB factory installed HD with 10.5.8.
Due to software reasons, I need to know whether the following is possible:
1. Keep my current HD + purchase a HD to store files off of the current HD.
2. Purchase 2 other HD's and have one running 10.6 and the other to store files off of that (10.6).
The Mac Pro will have 4 of its 6 HD bays populated.
When booting, have the option of selecting which HD I can boot off of - 10.5 or 10.6.
*Is this possible?*
Thank you.
Anthony

Sounds like an older hard drive.
Keep it for a backup system drive.
To boot 10.6 a drive needs to have partition table that is compatible and normally installing or initializing with 10.6.x will prepare and modify a Snow Leopard boot drive.
Same for RAID, if you have a boot array for Leopard it has to be recreated to work with Snow Leopard.
Get the fastest drives you can for boot drives.
Off load and keep media files, data and such on another drive.
Sorry to hear that you aren't currently using 4 internal drive bays to their full advantage (system, scratch, data, backup for instance).
Of course you can, you might just want to put 10.5.8 on one volume and 10.6.4 on another, on the same drive. But DO have cloned backups of those also on 4th drive.
If you want performance to the max, consider a couple SSDs off the 5th & 6th "ODD" ports.

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1. Ignore the Apple store rep.
2. You need to clarify:
I have my iphoto very organized into Events and I recently just moved them to be in folders
Moved them to be where in folder? In iPhoto? In the FInder?
I would like to have only certain Events (or folders/albums) on the external hard drive.
In an iPhoto Library? Or in the Finder?
Do not access the Library via the Finder or any other app. You risk damaging your Library and you will lose data.
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First, I followed the instructions on this site for Backing up itunes library by copying to a external hard drive.........
That's what it does. It makes a backup copy of the iTunes folder. iTunes will not use that folder or do anything to that folder.
All that succeeding in doing was mirroring whatever I did on the C:/ drive on the E:/ drive i.e. if I deleted itunes from the C:/ drive it disappeared from the E:/ drive.
Do you mean after you followed the instructions and copied \Music\iTunes folder to the external drive and then deleted something from iTunes, it deleted it from the external drive also?
As above, iTunes will not use or do anything to that folder.
Next, I followed these instructions for Moving the itunes media folder to the external drive.
Why? You already copied the entire iTunes folder (including th emedia folder) to the external drive.
Hold Shift and launch iTunes.
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This too didn't help as the media folder is not the problem, its the library as its 735kb!
What do you mean "the library"?
735kB is small for the iTunes library.itl file and a single file in iTunes is larger than that.
Am I right in thinking there's no way of moving the library to the external drive whilst wiping it from the C;/ drive?
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You can then delete \Music\iTunes on the C: drive.

Help needed - 2 OS's in 2 hard drives

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