You can create one partition on a Fusion drive, after that ,…no.
More info here. - http://support.apple.com/en-au/HT202574
My personal opinion on partitions on internal drives,…and again I point 
out,..this is my personal opinion, I think partitions are a waste of time.
You're not gaining any benefit with a partition, and nine times out of ten, 
down the track either Part A or Part B of the partition is the "wrong size". 
Then you have to go back to square one.
Generally just easier to a) get another external drive as a backup (as 
externals are cheap), as you'll spend less "money time" on it and can get 
larger sizes,…or just create a backup folder to back up to.
There's no real "benefit" in partitioning I find…not these days. It's not like 
if one partition dies it's not going to affect the other partition, as it's the 
same drive…….

Again, just my take on it,…..

Kind regards
Daniel

Sent from my iPhone 6

---
Daniel Kerr
MacWizardry

Phone: 0414 795 960
Email: <daniel AT macwizardry.com.au>
Web:   <http://www.macwizardry.com.au>


**For everything Apple**

NOTE: Any information provided in this email may be my personal opinion and as 
such should be taken accordingly, and may not be the views of MacWizardry. Any 
information provided does not offer or warrant any form of warranty or accept 
liability. It would be appreciated that if any information in this email is to 
be disseminated, distributed or copied, that permission by the author be 
requested. 

On 13/12/2014, at 1:04 PM, Alan Smith <[email protected]> wrote:

> I would like to utilise some of the vast unused space on the internal drives 
> of two iMacs as backups for films.    Is this possible?   If it is possible 
> then what is the downside?   Could such a partition be later removed to 
> restore the space to OS X?   I do not want to go through the disk-erase and 
> OS X re-install operation!
> 
> My concept is to use SuperDuper to create a sparse image (which permits smart 
> updates) of some of the films on a USB 3 external drive.     In practice I 
> would use say three sparse images for ease of management.
> 
> iMac 1 (2012) has 1TB with Fusion Drive.  iMac 2 (2009) has a standard 1TB 
> drive.  I would prefer to use the Fusion Drive iMac for the backups.  Both 
> iMacs have Mavericks installed, and hence should also have Recovery 
> partitions.   (If an OS X upgrade or Boot Camp can install partitions, why 
> not me??)
> 
> I have assumed a partition would be needed, but can a sparse image simply be 
> used as a file within the ‘Macintosh HD’ OS X startup volume structure?
> 
> 
> Regards, 
> Alan
> 
> Alan Smith
>  Late 2012 iMac 27" Intel Quad Core i5  Fusion 3.2GHz 8G RAM - OSX 10.9.5 
> Mavericks
>  Late 2009 iMac 21.5" Intel Core 2 Duo 3.06GHz 12G RAM - OSX 10.9.5 Mavericks
>  iPhone5;  iPad2;  ATV2
> 
> 
> 
> 
> 
> 
> 
> 
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>

-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>