Creating Volumes - Pros & Cons?

Just got a new 320GB external HD and am trying to decide how to set it up.
I figure I'll create 2 volumes as backups for my OS 10.4.11 and Classic via
Carbon Copy Cloner. That will leave about 250GB of space.
This space will be used for things like a Graphics Studio for Photoshop projects,
a Music Studio for recording and editing with Garage Band, a workshop for various
writing projects and a storage space for movies and iTunes music.
Would there be any advantage to separating these into volumes? My desktop is
already cluttered with volume icons for my 2 internal HDs (80GB and 120GB).
I feel I made a mistake creating so many volumes since it's a chore to re-size
or remove an existing volume.
So what is the advantage of volumizing HD space? Does it help to prevent fragmentation of data? And is that really a big problem?
A related question: Does that app for reorganizing volumes - I think it's called
Drive Genius - really work? I've heard some negative comments about it.
Advice and suggestions would be appreciated.

I have separate partitions on my internal & external backup hard drive. One partition is for OS 9.2.2 & apps, one partition is for OS 10.4.11 & apps, and a small bootable partition with diagnostic apps like Disk Warrior. All partitions are bootable.
You need to check if your Mac can use all of the 320GB. You may be limited to 128GB. Look at these links.
What Macs natively support large IDE drives? (over 128GB formatted)
http://forums.xlr8yourmac.com/action.lasso?-database=faq.fp3& layout=FaqList&-response=answer.faq.lasso&-recordID=34188&-search
How Big a Hard Drive Can I Put in My iMac, eMac, or Power Mac?
http://lowendmac.com/macdan/05/1024.html
Using 128 GB or Larger ATA Hard Drives
http://support.apple.com/kb/HT2544
The Power Mac Storage FAQ
http://forums.macnn.com/65/power-mac-and-mac-pro/246391/the-power-mac-storage-fa q/
Possible Alternative - SpeedTools ATA Hi-Cap Support Driver: Allows the use of extended capacity ATA drives (drives greater than 128 Gigabytes in size) on older (Pre Mirrored Door) G4 and G3 Macintoshes running MacOS X versions 10.2 and later. Cost $24.95
http://www.speedtools2.com/ATA6.html
Possible Alternative 2 - Larger than 128GB drives can be used by adding a PCI ATA/100 or ATA/133 controller card, one which is 48-bit LBA compliant; or by adding a PCI SATA controller card and using SATA drives.
 Cheers, Tom

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