Hard drive wont work on leopard after using mountain lion

My current imac at home runs on 10.5.8 which i think is Leopard.
I have been using an external hard drive for over a year with my mac.  A few days ago i decided to use my hard drive on my work imac which runs on the new Mountain Lion operating system.
I have since then tried using my external hard drive on my own imac and it does not appear on my desktop or in finder.
I have used disk utility to try repair and mount but neither worked.
My brother has a macbook pro running on snow leopard, i tried plugging it into his which appeared with the following message;
To use this disk, connect it to a Mac with Mac OSX v10.7 or later installed.
Can anyone help with this issue?

RossMcCluskey wrote:
I remember when i used the hard drive on my work computer i created an encryption in order to stop others from viewing my files while i was away from my desk.  Could this have something to do with the fact I cannot use the hard drive on my home imac?
Could be. I've never encrypted a disk, so don't know if that's affecting things. Try unencrypting it, copying the data elsewhere, erasing & reformatting, and restoring the data.
I have been wanting to upgrade to mountain lion for a while but unforunately i cannot download the app store to do so.  If there was any way of upgrading i think that might solve the problem.
Don't know if upgrading will solve the problem, but suspect not. Do note that you have to upgrade to Snow Leopard before Lion/ML.

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