My Time Machine will no longer find the drive I used to use to backup

For the past few months I have been using a partitioned LaCie 1tb hard drive as a Time Machine back up for my MacBook Air. The drive is plugged into a MacMini that is at my house and whilst at home my MacBook Air is connected via a wifi network and was backing up fine. After a recent software update on my MacMini I can no longer get Time Machine to work to that drive. I can connect to the drive through finder and even see the 'TimeMachine' file there,  but the Time Machine itself will not find the drive so won't back up. Now, trying to set it up again to that drive it won't locate it.
I have been reading forums and have checked the following things:
My Lacie drive is mounted to the MacMini
The file sharing is set to AFP on both the MacBook Air and the MacMini
The Lacie drive is formated to Mac OS Extended (Journaled)
I have done a 'Verify Disk' and it cam eup fine
There is ample space available
There are no other files on that part of the drive
I can access the other partitioned drive just fine (e.g. my iTunes library is based on that drive and music is playing)
I only recently purchased this hard drive so I could get extra storage space and partion it for Time Machine. It all worked fine until recently.
Does anyone have any other ideas on how to get Time Machine to find this drive again?
Thanks in advance!
K

the ipod is likely to be on automatically syncing currently. plug the ipod into a different computer and it will warn you that if you choose to sync with the new computer, the songs will be erased. when this warning pops up, select no. after the ipod appears in itunes and has not updated, go to the ipod options and you can select manually organize songs.
Go here for more information:
How to use your iPod to move your music to a new computer
  Windows XP Pro   Intel Core 2, 4GB RAM, SLi Configuration, 1.5TB

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