... New installation on an iMac.
No it's installed already.
I'm trying to partition and cannot due to this error. +HFS is not installed or something similar.
OK it's a new installation 2 days ago. When I try to use the disk utility to partition the drive in two I get this message.
File system support needed such as HFS+ with journaling enabled.
The drive is already in Mac OS extended (journaled)
In order to partition you will need to boot from the Apple supplied or over the counter OSX DVD. Partitioning will destroy your current system and all of your documents. Period. You need to select the type of file format you want from the drop down menu in the format tab of Disc utility. Select HFS+ (Journaled), then go to the partition tab and set up your partitions as desired. Once that is done and you format the partitions you will be able to install a new copy os OSX.
There are third party apps that will allow you to partition your drive without wiping everything out. Never having used any of them I will allow others to make suggestions.