Thanks very much for your input. I have managed to solve my problem. I think the partition solution was the one but I came at it slightly differently. After posting my message I plugged the drive into a PC just to see how it read on a different system - all looked good so I deleted the existing...
I am a Mac newbie so please bear with me with this request for advice. I just bought a Seagate 750 GB (698.6 Gb actual on disk) external firewire/usb drive as a backup device for my Intel iMac which has the same drive internally.
It mounted perfectly and as it came formatted as FAT32 I used...
